Срочно!!!1 решение на уровне 6 класса!! с 619 по 629!!

619.
-x - 7 = -5x
-7 = -4x
7 = 4x
x = $\frac{4}{7}$

620.
-5x + 2 = -10x
2 = -5x
x = - $\frac{2}{5}$

621.
-2x + 3 = -8x
3 = -6x
x = - $\frac{1}{2}$

622.
-4x = -10x - 9
6x = -9
x = -1 $\frac{1}{2}$

623.
6 + 3x = 4x - 1
x = 7

624.
-1 + 2x = 10x + 3
8x = -4
x = - $\frac{1}{2}$

625.
-4 + 3x = 8x + 5
5x = -9
x = -1 $\frac{4}{5}$

626.
9 + 4x = 8x - 9
4x = 18
x = 4 $\frac{1}{2}$

627.
2+ 8x = 3x + 9
5x = 11
x = 2 $\frac{1}{5}$

628.
6 - 2x = 4x - 10
5x = 16
x = 3 $\frac{1}{5}$

629.
5 - 2x = 8x + 9
10x = 14
x = 1 $\frac{2}{5}$

Срочно!!!1 решение ** уровне 6 класса!! с 619 по 629!!