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The mathematical representation of Boyle's law is P1V1 = P2V2. The answer to your question is C. I hope that this is the answer that you were looking for and it has helped you.
I got 1x + 27 which is the first one.
How I got it was..
4(x+3)+3(5-x)
4x+12+15-3x
1x+12+15
1x+27
The first one will be your answer