9(d+1)=90

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Solution for 9(d+1)=90 equation: 



9(d+1)=90

We move all terms to the left:

9(d+1)-(90)=0

We multiply parentheses

9d+9-90=0

We add all the numbers together, and all the variables

9d-81=0

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

9d=81

d=81/9

d=9

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