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-15z-12=2z+15
We move all terms to the left:
-15z-12-(2z+15)=0
We get rid of parentheses
-15z-2z-15-12=0
We add all the numbers together, and all the variables
-17z-27=0
We move all terms containing z to the left, all other terms to the right
-17z=27
z=27/-17
z=-1+10/17
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