а)5х+3(х-1)=6х+11
5х+3х-3=6х+11
5х+3х-6х=3+11
2х=14
Х=14:2
Х=7
в)6х+11=5х+3(х-1)
6х+11=5х+3х-3
6х+11=8х-3
6х-8х=-11-3
-2х=-14(×(-1))
2х=14
х=14÷2
х=7
б)8(y-7)-3(2y+9)=15
8у-56-6у-27=15
2у=98
у=49
г)0,5(2y - 1) - (0,5 - 0,2y) + 1 = 0;
0.5 * 2y - 0.5 * 1 - 0.5 + 0.2y + 1 = 0;
y - 0.5 - 0.5 + 0.2y + 1 = 0;
y + 0.2y = 0.5 + 0.5 - 1;
1.2y = 0;
y = 0.