7-p=12+9

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Solution for 7-p=12+9 equation: 



7-p=12+9

We move all terms to the left:

7-p-(12+9)=0

We add all the numbers together, and all the variables

-p+7-21=0

We add all the numbers together, and all the variables

-1p-14=0

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

-p=14

p=14/-1

p=-14

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