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20-12z=-19+3-16z
We move all terms to the left:
20-12z-(-19+3-16z)=0
We add all the numbers together, and all the variables
-12z-(-16z-16)+20=0
We get rid of parentheses
-12z+16z+16+20=0
We add all the numbers together, and all the variables
4z+36=0
We move all terms containing z to the left, all other terms to the right
4z=-36
z=-36/4
z=-9
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