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12+(-z)=17
We move all terms to the left:
12+(-z)-(17)=0
We add all the numbers together, and all the variables
(-1z)+12-17=0
We add all the numbers together, and all the variables
(-1z)-5=0
We get rid of parentheses
-1z-5=0
We move all terms containing z to the left, all other terms to the right
-z=5
z=5/-1
z=-5
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