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8.2=2p+4.2
We move all terms to the left:
8.2-(2p+4.2)=0
We get rid of parentheses
-2p-4.2+8.2=0
We add all the numbers together, and all the variables
-2p+4=0
We move all terms containing p to the left, all other terms to the right
-2p=-4
p=-4/-2
p=+2
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