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2+4.2p+8.2=28.2
We move all terms to the left:
2+4.2p+8.2-(28.2)=0
We add all the numbers together, and all the variables
4.2p-18=0
We move all terms containing p to the left, all other terms to the right
4.2p=18
p=18/4.2
p=4+1/3.5
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