(9*(x-5)+4*(6-x)):8=(3+3*(x+20)-2x)
5*(y-1)-3*(y-2)=7-y+3
РЕШИТЕ И СДЕЛАЙТЕ ПРОВЕРКУ
СРОЧНО!!!!!

(9(x-5)+4(6-x)):8 = 3+3(x+20)-2x
(9x-45+24-4x):8 = 3+3x+60-2x
9x-45+24-4x = 8(3+3x+60-2x)
9x-45+24-4x = 24+24x+480-16x
9x-4x-24x+16x = 24+480+45-24
-3x = 525
x = -175

Проверка:
(9(-175-5)+4(6+175):8 = 3+3(-175+20)-2(-175)
(9(-180)+4*181):8 = 3+3(-155)+350
(-1620+724):8 = -112
-896:8 = -112
-112 = -112

5(y-1)-3(y-2) = 7-y+3
5y-5-3y+6 = 7-y+3
5y-3y+y = 7-3+3
3y = 9
y = 3

Проверка:
5(3-1)-3(3-2) = 7-3+3
5*2-3*1 = 7
10-3 = 7
7=7