уравнение : 3х-1=2(x-2) ; 3(x+5)=7-5x ; 19(y-9)=3(y+7) ; 4(x-9)=3(x-8) ; 3(2x-9)=5(x-4) ; 7(3-2x)=15(1-x).
1)3х-1=2х-4 3х-2х=-4+1 х=-3 2)3х+15=7-15 8х=-8 х=-1 3)19у-171=3у+21 19у-3у=21+171 16у=192 у=12 4)4х-36=3х-24 4х-3х=-24+36 х=12 5)21-14х=15-15х -14х+15х=15-21 -х=-8 х=8
15-21=-6
3х-1=2(x-2); 3х-1=2х-4; 3х-2х=-4+1; х=-3 3(x+5)=7-5x; 3х+15=7-5х; 3х+5х=7-15; х=-1 19(y-9)=3(y+7); 19у-171=3у+21; 16у=192; у=12 4(x-9)=3(x-8); 4х-3х=36-24; х=12 3(2x-9)=5(x-4); 6х-27=5х-20; х=7 7(3-2x)=15(1-x); 21-14х=15-15х; -14х+15х=15-21; х=-6