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2p+(p+15)=90
We move all terms to the left:
2p+(p+15)-(90)=0
We get rid of parentheses
2p+p+15-90=0
We add all the numbers together, and all the variables
3p-75=0
We move all terms containing p to the left, all other terms to the right
3p=75
p=75/3
p=25
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