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2(p-21)=p
We move all terms to the left:
2(p-21)-(p)=0
We add all the numbers together, and all the variables
-1p+2(p-21)=0
We multiply parentheses
-1p+2p-42=0
We add all the numbers together, and all the variables
p-42=0
We move all terms containing p to the left, all other terms to the right
p=42
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