90=9(9+z)

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Solution for 90=9(9+z) equation: 



90=9(9+z)

We move all terms to the left:

90-(9(9+z))=0

We add all the numbers together, and all the variables

-(9(z+9))+90=0



We calculate terms in parentheses: -(9(z+9)), so:

9(z+9)

We multiply parentheses

9z+81

Back to the equation:

-(9z+81)



We get rid of parentheses

-9z-81+90=0

We add all the numbers together, and all the variables

-9z+9=0

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

-9z=-9

z=-9/-9

z=1

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