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