21=-7-7p

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Solution for 21=-7-7p equation: 



21=-7-7p

We move all terms to the left:

21-(-7-7p)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

7p+7+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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