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1p+2(p-3)=21
We move all terms to the left:
1p+2(p-3)-(21)=0
We add all the numbers together, and all the variables
p+2(p-3)-21=0
We multiply parentheses
p+2p-6-21=0
We add all the numbers together, and all the variables
3p-27=0
We move all terms containing p to the left, all other terms to the right
3p=27
p=27/3
p=9
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