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-13=-3p+8
We move all terms to the left:
-13-(-3p+8)=0
We get rid of parentheses
3p-8-13=0
We add all the numbers together, and all the variables
3p-21=0
We move all terms containing p to the left, all other terms to the right
3p=21
p=21/3
p=7
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