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3=5p+8p
We move all terms to the left:
3-(5p+8p)=0
We add all the numbers together, and all the variables
-(+13p)+3=0
We get rid of parentheses
-13p+3=0
We move all terms containing p to the left, all other terms to the right
-13p=-3
p=-3/-13
p=3/13
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