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-5z+12=2z+15
We move all terms to the left:
-5z+12-(2z+15)=0
We get rid of parentheses
-5z-2z-15+12=0
We add all the numbers together, and all the variables
-7z-3=0
We move all terms containing z to the left, all other terms to the right
-7z=3
z=3/-7
z=-3/7
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