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=7
17х=-34
Х=-2

11у-44+50-30у-12+9у=-6
-10у=0
У=0

40z-5-28z-7+56-32z=9
-20z=-35
Z=35/20
Z=7/4

30x-20-15x-6+55-20x=25
-5x=-4
X=4/5