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8-7=9Z-1
We move all terms to the left:
8-7-(9Z-1)=0
We add all the numbers together, and all the variables
-(9Z-1)+1=0
We get rid of parentheses
-9Z+1+1=0
We add all the numbers together, and all the variables
-9Z+2=0
We move all terms containing Z to the left, all other terms to the right
-9Z=-2
Z=-2/-9
Z=2/9
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