z+8x=112 6z + 6x = 84

z+8x=112

z+8x-8x=112-8x

z=112-8x

6z + 6x = 84 sub in z and solve for X

6(112-8x)+6x=84

672-48x+6x=84

672-42x=84

672-672-42x=84-672

-42x=-588

-42x/-42=-588/-42

x=14

z=112-8x

z=112-8(14)

z=112-112

z=0