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-20+17z=20z+4
We move all terms to the left:
-20+17z-(20z+4)=0
We get rid of parentheses
17z-20z-4-20=0
We add all the numbers together, and all the variables
-3z-24=0
We move all terms containing z to the left, all other terms to the right
-3z=24
z=24/-3
z=-8
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