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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
3z-27=0
We move all terms containing z to the left, all other terms to the right
3z=27
z=27/3
z=9
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