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81=23z-5-14z+5
We move all terms to the left:
81-(23z-5-14z+5)=0
We add all the numbers together, and all the variables
-(+9z)+81=0
We get rid of parentheses
-9z+81=0
We move all terms containing z to the left, all other terms to the right
-9z=-81
z=-81/-9
z=+9
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