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3p+9=4p-18
We move all terms to the left:
3p+9-(4p-18)=0
We get rid of parentheses
3p-4p+18+9=0
We add all the numbers together, and all the variables
-1p+27=0
We move all terms containing p to the left, all other terms to the right
-p=-27
p=-27/-1
p=+27
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