7=d+6d

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Solution for 7=d+6d equation: 



7=d+6d

We move all terms to the left:

7-(d+6d)=0

We add all the numbers together, and all the variables

-(+7d)+7=0

We get rid of parentheses

-7d+7=0

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

-7d=-7

d=-7/-7

d=1

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