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-80=z+8z-8
We move all terms to the left:
-80-(z+8z-8)=0
We add all the numbers together, and all the variables
-(9z-8)-80=0
We get rid of parentheses
-9z+8-80=0
We add all the numbers together, and all the variables
-9z-72=0
We move all terms containing z to the left, all other terms to the right
-9z=72
z=72/-9
z=-8
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