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2(42-2p)=-42
We move all terms to the left:
2(42-2p)-(-42)=0
We add all the numbers together, and all the variables
2(-2p+42)-(-42)=0
We add all the numbers together, and all the variables
2(-2p+42)+42=0
We multiply parentheses
-4p+84+42=0
We add all the numbers together, and all the variables
-4p+126=0
We move all terms containing p to the left, all other terms to the right
-4p=-126
p=-126/-4
p=31+1/2
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