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80=50+z
We move all terms to the left:
80-(50+z)=0
We add all the numbers together, and all the variables
-(z+50)+80=0
We get rid of parentheses
-z-50+80=0
We add all the numbers together, and all the variables
-1z+30=0
We move all terms containing z to the left, all other terms to the right
-z=-30
z=-30/-1
z=+30
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