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12z-3=2z-63
We move all terms to the left:
12z-3-(2z-63)=0
We get rid of parentheses
12z-2z+63-3=0
We add all the numbers together, and all the variables
10z+60=0
We move all terms containing z to the left, all other terms to the right
10z=-60
z=-60/10
z=-6
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