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-7=13-8P
We move all terms to the left:
-7-(13-8P)=0
We add all the numbers together, and all the variables
-(-8P+13)-7=0
We get rid of parentheses
8P-13-7=0
We add all the numbers together, and all the variables
8P-20=0
We move all terms containing P to the left, all other terms to the right
8P=20
P=20/8
P=2+1/2
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