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15+p=2p-3
We move all terms to the left:
15+p-(2p-3)=0
We get rid of parentheses
p-2p+3+15=0
We add all the numbers together, and all the variables
-1p+18=0
We move all terms containing p to the left, all other terms to the right
-p=-18
p=-18/-1
p=+18
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