12=-9+7p

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Solution for 12=-9+7p equation: 



12=-9+7p

We move all terms to the left:

12-(-9+7p)=0

We add all the numbers together, and all the variables

-(7p-9)+12=0

We get rid of parentheses

-7p+9+12=0

We add all the numbers together, and all the variables

-7p+21=0

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

-7p=-21

p=-21/-7

p=+3

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