-91=7d+6d

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Solution for -91=7d+6d equation: 



-91=7d+6d

We move all terms to the left:

-91-(7d+6d)=0

We add all the numbers together, and all the variables

-(+13d)-91=0

We get rid of parentheses

-13d-91=0

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

-13d=91

d=91/-13

d=-7

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