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7=1-2p
We move all terms to the left:
7-(1-2p)=0
We add all the numbers together, and all the variables
-(-2p+1)+7=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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