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13=-p-8
We move all terms to the left:
13-(-p-8)=0
We add all the numbers together, and all the variables
-(-1p-8)+13=0
We get rid of parentheses
1p+8+13=0
We add all the numbers together, and all the variables
p+21=0
We move all terms containing p to the left, all other terms to the right
p=-21
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