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-8z=120-2z
We move all terms to the left:
-8z-(120-2z)=0
We add all the numbers together, and all the variables
-8z-(-2z+120)=0
We get rid of parentheses
-8z+2z-120=0
We add all the numbers together, and all the variables
-6z-120=0
We move all terms containing z to the left, all other terms to the right
-6z=120
z=120/-6
z=-20
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