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13=8p-15-7p
We move all terms to the left:
13-(8p-15-7p)=0
We add all the numbers together, and all the variables
-(p-15)+13=0
We get rid of parentheses
-p+15+13=0
We add all the numbers together, and all the variables
-1p+28=0
We move all terms containing p to the left, all other terms to the right
-p=-28
p=-28/-1
p=+28
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