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3=42+p
We move all terms to the left:
3-(42+p)=0
We add all the numbers together, and all the variables
-(p+42)+3=0
We get rid of parentheses
-p-42+3=0
We add all the numbers together, and all the variables
-1p-39=0
We move all terms containing p to the left, all other terms to the right
-p=39
p=39/-1
p=-39
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