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2(2p)=p+42
We move all terms to the left:
2(2p)-(p+42)=0
We get rid of parentheses
22p-p-42=0
We add all the numbers together, and all the variables
21p-42=0
We move all terms containing p to the left, all other terms to the right
21p=42
p=42/21
p=2
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