21=-12+p

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Solution for 21=-12+p equation: 



21=-12+p

We move all terms to the left:

21-(-12+p)=0

We add all the numbers together, and all the variables

-(p-12)+21=0

We get rid of parentheses

-p+12+21=0

We add all the numbers together, and all the variables

-1p+33=0

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

-p=-33

p=-33/-1

p=+33

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