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题目来源：
OG详解-OG6 数学1 Q17
正确答案：D
题目详解
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Choice D is correct. It’s given that the values of P, N, and C are positive. Therefore, dividing each side of the given equation byPN = 19-C. Subtracting 19 from each side of this equation side of this equation yields PN -19= -C. Dividing each side of this equation by -1 yields
19−PN=C，or C= 19−PN.
Choice A is incorrect. This equation is equivalent to P = NC-19, not P = N(19-C). Choice B is incorrect. This equation is equivalent to P = 19-NC, not P = N(19-C). Choice C is incorrect. This equation is equivalent to P = N(C-19), not P = N(19-C).
19−PN=C，or C= 19−PN.
Choice A is incorrect. This equation is equivalent to P = NC-19, not P = N(19-C). Choice B is incorrect. This equation is equivalent to P = 19-NC, not P = N(19-C). Choice C is incorrect. This equation is equivalent to P = N(C-19), not P = N(19-C).
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