R = PV/nT goes to nT = PV/R.
Then T is PV/nR.
Note that T is PV/nR goes to PV = nRT which is the
usual form of the Ideal Gas Law.
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Take P = k/1 + cB-t to P = k + cB-tor
c/Bt = P − k. Then c = Bt[P − k].