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(3z-12)=162
We move all terms to the left:
(3z-12)-(162)=0
We get rid of parentheses
3z-12-162=0
We add all the numbers together, and all the variables
3z-174=0
We move all terms containing z to the left, all other terms to the right
3z=174
z=174/3
z=58
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