3p+9p=-12

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Solution for 3p+9p=-12 equation: 



3p+9p=-12

We move all terms to the left:

3p+9p-(-12)=0

We add all the numbers together, and all the variables

12p+12=0

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

12p=-12

p=-12/12

p=-1

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