12=21+p

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Solution for 12=21+p equation: 



12=21+p

We move all terms to the left:

12-(21+p)=0

We add all the numbers together, and all the variables

-(p+21)+12=0

We get rid of parentheses

-p-21+12=0

We add all the numbers together, and all the variables

-1p-9=0

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

-p=9

p=9/-1

p=-9

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