7(d+1)=91

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Solution for 7(d+1)=91 equation: 



7(d+1)=91

We move all terms to the left:

7(d+1)-(91)=0

We multiply parentheses

7d+7-91=0

We add all the numbers together, and all the variables

7d-84=0

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

7d=84

d=84/7

d=12

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