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7=5z+12
We move all terms to the left:
7-(5z+12)=0
We get rid of parentheses
-5z-12+7=0
We add all the numbers together, and all the variables
-5z-5=0
We move all terms containing z to the left, all other terms to the right
-5z=5
z=5/-5
z=-1
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