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3(5p-3)=21
We move all terms to the left:
3(5p-3)-(21)=0
We multiply parentheses
15p-9-21=0
We add all the numbers together, and all the variables
15p-30=0
We move all terms containing p to the left, all other terms to the right
15p=30
p=30/15
p=2
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