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(12z+2)=42
We move all terms to the left:
(12z+2)-(42)=0
We get rid of parentheses
12z+2-42=0
We add all the numbers together, and all the variables
12z-40=0
We move all terms containing z to the left, all other terms to the right
12z=40
z=40/12
z=3+1/3
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