+7d=+91

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Solution for +7d=+91 equation: 



+7d=+91

We move all terms to the left:

+7d-(+91)=0

We add all the numbers together, and all the variables

7d-91=0

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

7d=91

d=91/7

d=13

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