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6z-13=z+12
We move all terms to the left:
6z-13-(z+12)=0
We get rid of parentheses
6z-z-12-13=0
We add all the numbers together, and all the variables
5z-25=0
We move all terms containing z to the left, all other terms to the right
5z=25
z=25/5
z=5
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