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15.5=2p+3.5
We move all terms to the left:
15.5-(2p+3.5)=0
We get rid of parentheses
-2p-3.5+15.5=0
We add all the numbers together, and all the variables
-2p+12=0
We move all terms containing p to the left, all other terms to the right
-2p=-12
p=-12/-2
p=+6
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