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7=2p+1
We move all terms to the left:
7-(2p+1)=0
We get rid of parentheses
-2p-1+7=0
We add all the numbers together, and all the variables
-2p+6=0
We move all terms containing p to the left, all other terms to the right
-2p=-6
p=-6/-2
p=+3
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