А)5(у+2/3)-3=4(3y-1/2)
5y+10/3-3=12y-2
5y-12y=-10/3+3-2
-7y=-7/3
y=7/3:7
у=1/3
б)7(2у-2)-2(3у-3,5)=9
14у-14-6у+7=9
8у=9+14-7
8у=16
у=16:8
у=2
в)21,5(4х-1)+8(12,5-9х)=82
86х-21,5+100-72х=82
14х=82+21,5+72
14х=175,5
х=175,5:14
х=12.75/140
х=12.15/28
г)12,5(3х-1)+132,4=(2,8-4х)0,5
37,5х-12,5+132,4=1,4-2х
37,5х+2х=12,5-132,4+1,4
39,5х= -118,5
х=-118,5:39,5
х= -3