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3=15-3p
We move all terms to the left:
3-(15-3p)=0
We add all the numbers together, and all the variables
-(-3p+15)+3=0
We get rid of parentheses
3p-15+3=0
We add all the numbers together, and all the variables
3p-12=0
We move all terms containing p to the left, all other terms to the right
3p=12
p=12/3
p=4
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