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