-21=3(5d+7)

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Solution for -21=3(5d+7) equation: 



-21=3(5d+7)

We move all terms to the left:

-21-(3(5d+7))=0



We calculate terms in parentheses: -(3(5d+7)), so:

3(5d+7)

We multiply parentheses

15d+21

Back to the equation:

-(15d+21)



We get rid of parentheses

-15d-21-21=0

We add all the numbers together, and all the variables

-15d-42=0

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

-15d=42

d=42/-15

d=-2+4/5

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