5(x-3)-2(x-7)+7(2x+6)=7
11(y-4)+10(5-3y)-3(4-3y)=-6
5(8z-1)-7(4z+1)+8(7-4x)=9
10(3x-2)-3(5x+2)+5(11-4x)=25
11 2-x
----=----
7 5

5х-15-2х+14+14х+42=717х=-34Х=-211у-44+50-30у-12+9у=-6-10у=0У=040z-5-28z-7+56-32z=9-20z=-35Z=35/20Z=7/430x-20-15x-6+55-20x=25-5x=-4X=4/5