(X-2) (x-3) - 3 (x ^ 2-7x + 13) where x = 7 / 2

(X-2) (x-3) - 3 (x ^ 2-7x + 13) where x = 7 / 2

simple form
=x²-5x+6-3(x²-7x+13)
=x²-5x+6-3x²+21x-39
=-2x²+16x-33
=-2*49/4+16*7/2-33
=-49/2+56-33
=-3/2

8 / 9 △ x = 1 / 12 (solving the equation)

8 / 9 △ x = 1 / 12 times x on both sides
8 / 9 = 1 / 12 x
X = 8 / 9 △ 1 / 12
X = 8 / 9 × 12
X = 32 / 3
X = 10 and 2 / 3
I understand. Please accept,
If you have any new questions, please ask for help,

3x^2+4x^2=40^2
Hurry!

3x^2+4x^2=40^2
7x^2=40^2
x^2=40^2/7
X = ± 40 root 7 / 7

3/5x+990=6/7x

3/5X+990=6/7X
990=6/7X-3/5X
990=30/35X-21/35X
990=9/35X
X=990*(35/9)=3850

x+7÷ x^3+5x^2+7x+3

Equals 5x ^ 5 + 8x ^ 4 + 3x ^ 3 + 7

x^3-5x^2+x^2-7x+10
Factorization

=x^2(x-5)+(x-5)(x-2)
=(x-5)(x^2+x-2)
=(x-5)(x+2)(x-1)

1/4（5-7x)=1/3(2-5x)-7/2

1/4（5-7x)=1/3(2-5x)-7/2
15--21X=4(2-5x)-42
15-21x=8-20x-42
21x-20x=15+34
x=49
(the famous wonderful wine on the top floor is miscalculated, hee hee) (also: if the landlord doesn't believe it, check it with a calculator ~)

3/5x+2/7x+7=x

3/5x+2/7x-x= -7
Multiply both sides by 35
21x+10x-35x= -245
-4x=-245
x=245/4
This kind of problem is not difficult, you just need to move the one with X to the same side and simplify it

How much is x = 1 / 6x + 1 / 12x + 1 / 7X + 5 + 1 / 2x + 4?

x=1/6x+1/12x+1/7x+5+1/2x+4
x=(14+7+12+42)/84*x+9
x=75/84x+9
9/84x=9
x=84

X = 1 / 6x + 1 / 12x + 1 / 7X + 1 / 2x + 5 + 4, the answer is 84, how to calculate?

x=14/84x+7/84x+12/84x+42/84x+5+4
x=75/84x+5+4
x-75/84x=9
9/84x=9
x=9*84/9
x=84