Х-5/4=7- 2х-11/3
х-5/4=21/3-3(2х-11)/3
21/3-6х-33/3=х-5/4
21-6х-33/3=-12-6х/3=-2(2+х)=-4-2х
х-5=4(-4-2х)
х-5=-16-8х
х+8х=-16+5
9х=-9
х=-1
15/3+7х-12/3
15+7х-12/3=3+7х/3
3+7х=3х+39
39-3=-7х+3х
36=-4х
-х=-9
2-7у+2(4у+7)/6=16-у/6=-у/2
2(16-у)=-6у
32-2у=-6у
32=4у
у=8
7у-1-3(у+1)/12=2у+5/3
7у-1-3у-3/12
4у-4/12=4(у-1)/12=у-1/3
3(у-1)=3(2у+5)
3у-3=6у+15
3у-6у=3+15
-3у=18
-у=-6