7-9x/2-3x+4x-5/3x-2=1 Solve this equation

7-9x/2-3x+4x-5/3x-2=1 Solve this equation

Should your formula be:
7-9x/(2-3x)+(4x-5)/(3x-2)=1?
If so, then
6+9x/（3x-2）+(4x-5)/(3x-2)=0
Then 13x-5 = 12-18x
x=17/31

Who can help me solve this equation problem, 2 (16-x) + 4x = 52

2（16—x）+4x=52
32-2x+4x=52
32+2x=52
2x=52-32
2x=20
x=10

Simple calculation (8 / 15 + 9 / 20 * 2 / 3) △ 1 / 12 (0.4 + 2 / 3) / (5 / 6-0.75) * 0.5 equation 1 / 4x + 3 / 4x = 1 / 3 7 / 16: x = 7 / 8:32 / 9

（8/15+9/20*2/3）÷1/12
=（8/15+3/10）×12
=8/15×12+3/10×12
=6.4+3.6
=10
（0.4+2/3）/（5/6-0.75）*0.5
=16/15*0.5/（1/12）
=8/15×12
=6.4
1/4x+3/4x=1/3
x=1/3
7/16：x =7/8：32/9
7/8x=7/16×32/9
7/8x=14/9
x=16/9

RL Series Circuit how to find the total resistance? Urgent!
Fluorescent lamp circuit, fluorescent lamp R1 = 150 Ω, ballast R2 = 60 Ω, inductance l1.12h, AC 220 V, frequency 50 Hz,
In this problem, I have a problem in finding the total resistance R of the circuit,
Is the total resistance R1 + R2 or R1 + R2 + XL (impedance)

Originally, impedance and resistance are two concepts, impedance = resistance + reactance

It is known that a = {x | - 2 is less than or equal to x, less than or equal to 7}, B = {x | - M + 1 is less than x

M 1 is greater than or equal to 2
2.2m-1 up to 7
3.2m-1 is greater than M 1 (this step is particularly important to exclude the possibility of empty sets)
4. Intersection of three inequalities

As shown in the figure △ AOB, ∠ AOB = 120 ° BD, AC are two high connecting CD, if AB = 4, then the length of DC is______ ．

∵∠AOB=120°，∴∠DOA=∠COB=180°-120°=60°，∵AD⊥BD，BC⊥AC，∴∠ADB=∠BCA=90°，∴∠DAC=∠CBD=30°，∴OCOB=12，ODOA=12，∴ODOA=OCOB，∵∠AOB=∠DOC，∴△DOC∽△AOB，∴DCAB=ODOA=12，∵AB=4，∴CD=2...

Let v be a linear space composed of n-order real symmetric matrix by the usual matrix addition and multiplication, find the dimension of V and a set of bases of V, which God can help

Let e (ij) be a matrix in which the elements in row I and column J are 1 and the other elements are 0,
Then E (ij) + e (Ji), 1

The positional relationship between point, line and plane
If the two sides of two angles in space are parallel, are the two angles equal or complementary?

Not true For example, the corner has three right angles, any two right angles have a coincident edge, and the remaining two edges are vertical

Finding the definite integral of (SiNx) ^ 2 in (0, π / 2)
Why is it wrong to change it into - ∫ SiNx dcosx by using the method of approximate differentiation?
I know that (SiNx) ^ 2 should be changed into (1-cos2x) / 2. I just want to understand why it's wrong to do it by using the approximate differential,
-∫ SiNx dcosx, using the method of substitution, let cosx = t, the original formula = ∫ t'dt integrate on (1,0). What's wrong?

Wrong. If you use the substitution method, after the substitution, only the element that has been substituted can appear in the formula, and it can't have X or derivative form, otherwise it's difficult to continue to calculate

English translation
It is wise to take an umbrella on cloudy days
I lost my way in the snowstorm yesterday

It's wise to carry an umbrella on a cloudy day.
I lost my way in the snowstorm yesterday.