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-4z+80=85-9z
We move all terms to the left:
-4z+80-(85-9z)=0
We add all the numbers together, and all the variables
-4z-(-9z+85)+80=0
We get rid of parentheses
-4z+9z-85+80=0
We add all the numbers together, and all the variables
5z-5=0
We move all terms containing z to the left, all other terms to the right
5z=5
z=5/5
z=1
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