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20-13z+12z=z-16
We move all terms to the left:
20-13z+12z-(z-16)=0
We add all the numbers together, and all the variables
-1z-(z-16)+20=0
We get rid of parentheses
-1z-z+16+20=0
We add all the numbers together, and all the variables
-2z+36=0
We move all terms containing z to the left, all other terms to the right
-2z=-36
z=-36/-2
z=+18
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