80=9z+7z

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Solution for 80=9z+7z equation: 



80=9z+7z

We move all terms to the left:

80-(9z+7z)=0

We add all the numbers together, and all the variables

-(+16z)+80=0

We get rid of parentheses

-16z+80=0

We move all terms containing z to the left, all other terms to the right

-16z=-80

z=-80/-16

z=+5

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