81=9(z+1)

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Solution for 81=9(z+1) equation: 



81=9(z+1)

We move all terms to the left:

81-(9(z+1))=0



We calculate terms in parentheses: -(9(z+1)), so:

9(z+1)

We multiply parentheses

9z+9

Back to the equation:

-(9z+9)



We get rid of parentheses

-9z-9+81=0

We add all the numbers together, and all the variables

-9z+72=0

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

-9z=-72

z=-72/-9

z=+8

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