5х+30-12х=42
5х-12х-12=0
-7х=12
х=-12/7;
36*(х-3) =10-2*(х+2)
36х-108=10-2х-4
38х=114
х=3
1) 5х+30-12х=42
5х-12х=42-30
-7х=8
х=-8/7
х=-1 1/7
2) 36*(х-3)=10-2*(х+2)
36х+2х=10-4+108
х=114:38
