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12z-75=z+68
We move all terms to the left:
12z-75-(z+68)=0
We get rid of parentheses
12z-z-68-75=0
We add all the numbers together, and all the variables
11z-143=0
We move all terms containing z to the left, all other terms to the right
11z=143
z=143/11
z=13
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