1/3(3х-6)-2/7(7х-21)=91/3*3х-1/3*6-2/7*7х+2/7*21=9
х-2-2х-6=9
х-2х=9+2+6
-х=5
х= -5
5.4(3у-2)-7.2(2у-3)=1.2
5.4*3у-5.4*2-7.2*2у+7.2*3=1.2
16.2у-10.8-14.4у+21.6=1.2
1.8у= -9.6
у= -5.33333= -5 1/3
1/3(3х-6)-2/7(7х-21)=9
1/3*3х-1/3*6-2/7*7х+2/7*21=9
х-2-2х-6=9
х-2х=9+2+6
-х=5
х= -5
5.4(3у-2)-7.2(2у-3)=1.2
5.4*3у-5.4*2-7.2*2у+7.2*3=1.2
16.2у-10.8-14.4у+21.6=1.2
1.8у= -9.6
у= -5.33333= -5 1/3