21=7(d+1)

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Solution for 21=7(d+1) equation: 



21=7(d+1)

We move all terms to the left:

21-(7(d+1))=0



We calculate terms in parentheses: -(7(d+1)), so:

7(d+1)

We multiply parentheses

7d+7

Back to the equation:

-(7d+7)



We get rid of parentheses

-7d-7+21=0

We add all the numbers together, and all the variables

-7d+14=0

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

-7d=-14

d=-14/-7

d=+2

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