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z-31=2z-98
We move all terms to the left:
z-31-(2z-98)=0
We get rid of parentheses
z-2z+98-31=0
We add all the numbers together, and all the variables
-1z+67=0
We move all terms containing z to the left, all other terms to the right
-z=-67
z=-67/-1
z=+67
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