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-20+13z=20+17z
We move all terms to the left:
-20+13z-(20+17z)=0
We add all the numbers together, and all the variables
13z-(17z+20)-20=0
We get rid of parentheses
13z-17z-20-20=0
We add all the numbers together, and all the variables
-4z-40=0
We move all terms containing z to the left, all other terms to the right
-4z=40
z=40/-4
z=-10
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