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3(5+p)=21
We move all terms to the left:
3(5+p)-(21)=0
We add all the numbers together, and all the variables
3(p+5)-21=0
We multiply parentheses
3p+15-21=0
We add all the numbers together, and all the variables
3p-6=0
We move all terms containing p to the left, all other terms to the right
3p=6
p=6/3
p=2
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