1) .........................
3(х-5)=7*3*4 - 4(2х-11)
3х-15=84-8х+44
11х=143
х=143:11
х=13
2) ...........................
5*3+7х-12=3*(х+13)
15+7х-12=3х+39
4х=36
х=9
3) .........................
2-7у+2(4у+7)= -3у
2-7у+8у+14= -3у
4у= -16
у= - 16:4
у= -4
4) ...........................
7у-1-3(у+1)=4(2у+5)
7у-1-3у-3=8у+20
4у-4=8у+20
8у-4у= -20-4
4у= -16
у= -4