Решите уравнение 3(x-7)-(9-2x)=2(12-x)-(x-10)
3х-21-9+2х= 24 -2х -х+10 5х-30=34-3х 5х+3х=34+30 8х=64 х=8
3х-21-9+2х=24-2х-х+10; 5х-30=-3х+34; 8х=34+30; 8х=64; х=8.