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=-7+4Z
We move all terms to the left:
-(-7+4Z)=0
We add all the numbers together, and all the variables
-(4Z-7)=0
We get rid of parentheses
-4Z+7=0
We move all terms containing Z to the left, all other terms to the right
-4Z=-7
Z=-7/-4
Z=1+3/4
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