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