5х+(3х-7)=9
5х+3х-7=9
8х=16
х=16:8
х=2
3у-(5-у)=11
3у-5+у=11
4у=16
у=4
(7а+1)-(6а+3)=5
7а+1-6а-3=5
а=7
4(0.2х-7)-5(0.3х+6)=5
0.8х-28-1.5х-30=5
-0.7х=63
х=90
2х+5=2(х+1)+11
2х+5= 2х+2+11
2х-2х=13-5
0=8
ответа нет
5(3х+1.2)+х=6.8
15х+6+х=6.8
16х=0.8
х=0.05
(8S+11)-13=9s-5
8s+11-13=9s-5
-s=-3
s=3
4(3-h)-11=7(2h-5)
12-4h-11=14h-35
-18h=-36
h=2