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z+27=2z-15
We move all terms to the left:
z+27-(2z-15)=0
We get rid of parentheses
z-2z+15+27=0
We add all the numbers together, and all the variables
-1z+42=0
We move all terms containing z to the left, all other terms to the right
-z=-42
z=-42/-1
z=+42
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