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=100+Z78.54
We move all terms to the left:
-(100+Z78.54)=0
We add all the numbers together, and all the variables
-(Z78.54+100)=0
We get rid of parentheses
-Z78.54-100=0
We move all terms containing Z to the left, all other terms to the right
-Z78.54=100
Z=100/1
Z=100
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