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7z=-20+8z
We move all terms to the left:
7z-(-20+8z)=0
We add all the numbers together, and all the variables
7z-(8z-20)=0
We get rid of parentheses
7z-8z+20=0
We add all the numbers together, and all the variables
-1z+20=0
We move all terms containing z to the left, all other terms to the right
-z=-20
z=-20/-1
z=+20
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