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