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4=7p+8p
We move all terms to the left:
4-(7p+8p)=0
We add all the numbers together, and all the variables
-(+15p)+4=0
We get rid of parentheses
-15p+4=0
We move all terms containing p to the left, all other terms to the right
-15p=-4
p=-4/-15
p=4/15
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