Question

вот зделайте пж быстро ​

Answer 1

$7x - (3 + 2x) = x + 9 \\ 7x - 3 - 2x = x + 9 \\ 5x - 3 = x + 9 \\ 5x - x = 9 + 3 \\ 4x = 12 \\ x = 3$

$13 - (2x - 5) = x - 3 \\ 13 - 2x + 5 = x - 3 \\ 18 - 2x = x - 3 \\ - 2x - x = - 3 - 18 \\ - 3x = - 21 \\ x = 7$