9(d+1)=81

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



9(d+1)=81

We move all terms to the left:

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

We multiply 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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