7 + 4x = 5x-2 to solve the equation

7 + 4x = 5x-2 to solve the equation

transposition
5x-4x=7+2
x=9

If the cube root of (9x + 2) and (- 4Y-2) are opposite numbers, then the arithmetic square root of X / y is?

The cube root of (9x + 2) and (- 4Y-2) are opposite to each other
The cube roots of (9x + 2) = - (- 4Y-2) are opposite to each other
Both sides are cubic at the same time
9x+2=4y+2
9x=4y
That is, X / y = 4 / 9
The arithmetic square root of X / y is 2 / 3

7x+3y-36=0,2x+9y-51=0

By multiplying equation by 3 and subtracting equation 2, y can be eliminated
19x=57
x=3
Bring in equation 1
21-3y-36=0
3y=15
y=5
So x = 3, y = 5

The second power of 3a-6a + 12 factorization

3a^2-6a+12
=3( a^2-2a+4)
=3(a^2-2a+1+3)
=3(a^2-2a+1)+9
=3(a-1)^2+9

Proof of coplanarity of four points of space vector
If ABC three points are not collinear, take any point P to prove ABCP four points are collinear
There must be a clear process!

Your topic is wrong. It should be to verify ABCP's four points
It is proved by vector method that the coplanar problem of four points should be transformed into the coplanar problem of two non collinear vectors
1 4 points constitute 2 parallel lines
Two has three points collinear
Two vectors composed of 3 and 4 points are collinear
Satisfy any condition

In our life, what phenomena are friction phenomena. 20 examples

Friction is everywhere. Without friction, you can't walk and hold chopsticks. In daily life, a car moves forward by the friction between the tire and the ground. Friction is usually divided into sliding friction, rolling friction and static friction

5x-5 = 6x equals?

5x-5=6x
5x-6x-5=6x-6x
-x-5=0
-x=5
x=-5

Addition and subtraction of fractions: 1 / (X-5) - 6 / (x ^ 2-25) - (x + 1) / (10 + 2x)

1/(x-5)-6/(x^2-25)-(x+1)/(10+2x)
=2(x+5)/2(x^2-25)-12/2(x^2-25)-2(x+1)(x-5)/2(x^2-25)
=[2x+10-12-2(x^2-4x-5)]/2(x^2-25)
=(2x-2-2x^2+6x+10)/2(x^2-25)
=(8x-2x^2+8)/2(x^2-25)
=(4x-x^2+4)/(x^2-25)

Such as abacus

Wishful thinking

The simple algorithm is 5.4 × 910 + 3.6 △ 109 + 0.978 × 3796-314 + 3459 × [34 - (716-14)] [47 - (18.875-1 △ 815)] and 0.46 × 4625

①5.4×910+3.6÷109+0.9=5.4×0.9+3.6×0.9+0.9×1=0.9×（5.4+3.6+1）=0.9×10=9；②78×379=（79-1）×379=79×379−379×1=3-379=27679；③6-314+34=3+3+34-334=3+[（3+34）-334]=3；④59×[34-（716-14）]=59×...