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18=15+3p
We move all terms to the left:
18-(15+3p)=0
We add all the numbers together, and all the variables
-(3p+15)+18=0
We get rid of parentheses
-3p-15+18=0
We add all the numbers together, and all the variables
-3p+3=0
We move all terms containing p to the left, all other terms to the right
-3p=-3
p=-3/-3
p=1
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