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28=2p+4
We move all terms to the left:
28-(2p+4)=0
We get rid of parentheses
-2p-4+28=0
We add all the numbers together, and all the variables
-2p+24=0
We move all terms containing p to the left, all other terms to the right
-2p=-24
p=-24/-2
p=+12
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