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7p/7=400/7
We move all terms to the left:
7p/7-(400/7)=0
We add all the numbers together, and all the variables
7p/7-(+400/7)=0
We get rid of parentheses
7p/7-400/7=0
We multiply all the terms by the denominator
7p-400=0
We move all terms containing p to the left, all other terms to the right
7p=400
p=400/7
p=57+1/7
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