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z-1=3z-39
We move all terms to the left:
z-1-(3z-39)=0
We get rid of parentheses
z-3z+39-1=0
We add all the numbers together, and all the variables
-2z+38=0
We move all terms containing z to the left, all other terms to the right
-2z=-38
z=-38/-2
z=+19
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