А) -(7-3у)=8-8(2-у) б) -5(2-2х)=2(х-3)+4 в) 2х-4(х+7)=3(2-х)

А) -(7-3y) = 8-8(2-y) 
-7+3y = 8-12+8y
8y-3y = 12-7
5y = 5
y = 5/5
y = 1

б) -5(2-2x) = 2(x-3)+4
-10+10x = 2x-6+4
10x-2x = 10-6+4
8x = 8
x = 8/8
x = 1

в) 2x-4(x+7) = 3(2-x)
2x-4x-28 = 6-3x
2x-4x+3x = 6+28
x = 34