21=7(7+p)

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Solution for 21=7(7+p) equation: 



21=7(7+p)

We move all terms to the left:

21-(7(7+p))=0

We add all the numbers together, and all the variables

-(7(p+7))+21=0



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

7(p+7)

We multiply parentheses

7p+49

Back to the equation:

-(7p+49)



We get rid of parentheses

-7p-49+21=0

We add all the numbers together, and all the variables

-7p-28=0

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

-7p=28

p=28/-7

p=-4

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