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12-81=9z-7
We move all terms to the left:
12-81-(9z-7)=0
We add all the numbers together, and all the variables
-(9z-7)-69=0
We get rid of parentheses
-9z+7-69=0
We add all the numbers together, and all the variables
-9z-62=0
We move all terms containing z to the left, all other terms to the right
-9z=62
z=62/-9
z=-6+8/9
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