21=-35+8d

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Solution for 21=-35+8d equation: 



21=-35+8d

We move all terms to the left:

21-(-35+8d)=0

We add all the numbers together, and all the variables

-(8d-35)+21=0

We get rid of parentheses

-8d+35+21=0

We add all the numbers together, and all the variables

-8d+56=0

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

-8d=-56

d=-56/-8

d=+7

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