90=18+8z

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Solution for 90=18+8z equation: 



90=18+8z

We move all terms to the left:

90-(18+8z)=0

We add all the numbers together, and all the variables

-(8z+18)+90=0

We get rid of parentheses

-8z-18+90=0

We add all the numbers together, and all the variables

-8z+72=0

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

-8z=-72

z=-72/-8

z=+9

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