21=7-5p-6

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Solution for 21=7-5p-6 equation: 



21=7-5p-6

We move all terms to the left:

21-(7-5p-6)=0

We add all the numbers together, and all the variables

-(-5p+1)+21=0

We get rid of parentheses

5p-1+21=0

We add all the numbers together, and all the variables

5p+20=0

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

5p=-20

p=-20/5

p=-4

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