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20z-56=17z-29
We move all terms to the left:
20z-56-(17z-29)=0
We get rid of parentheses
20z-17z+29-56=0
We add all the numbers together, and all the variables
3z-27=0
We move all terms containing z to the left, all other terms to the right
3z=27
z=27/3
z=9
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