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3(2p-2)=21
We move all terms to the left:
3(2p-2)-(21)=0
We multiply parentheses
6p-6-21=0
We add all the numbers together, and all the variables
6p-27=0
We move all terms containing p to the left, all other terms to the right
6p=27
p=27/6
p=4+1/2
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