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12=z/6-30
We move all terms to the left:
12-(z/6-30)=0
We get rid of parentheses
-z/6+30+12=0
We multiply all the terms by the denominator
-z+30*6+12*6=0
We add all the numbers together, and all the variables
-1z+252=0
We move all terms containing z to the left, all other terms to the right
-z=-252
z=-252/-1
z=+252
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