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12z-18=13z+18
We move all terms to the left:
12z-18-(13z+18)=0
We get rid of parentheses
12z-13z-18-18=0
We add all the numbers together, and all the variables
-1z-36=0
We move all terms containing z to the left, all other terms to the right
-z=36
z=36/-1
z=-36
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