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12z+12=13z+6
We move all terms to the left:
12z+12-(13z+6)=0
We get rid of parentheses
12z-13z-6+12=0
We add all the numbers together, and all the variables
-1z+6=0
We move all terms containing z to the left, all other terms to the right
-z=-6
z=-6/-1
z=+6
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