91=d+7

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Solution for 91=d+7 equation: 



91=d+7

We move all terms to the left:

91-(d+7)=0

We get rid of parentheses

-d-7+91=0

We add all the numbers together, and all the variables

-1d+84=0

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

-d=-84

d=-84/-1

d=+84

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