81=9(d+1)

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



81=9(d+1)

We move all terms to the left:

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



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

9(d+1)

We multiply parentheses

9d+9

Back to the equation:

-(9d+9)



We get rid of parentheses

-9d-9+81=0

We add all the numbers together, and all the variables

-9d+72=0

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

-9d=-72

d=-72/-9

d=+8

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