Solve the following pairs of linear equations: $\frac{2}{x} + \frac{3}{y} = \frac{9}{xy}, \quad \frac{4}{x} + \frac{9}{y} = \frac{21}{xy} \quad (x \neq 0, y \neq 0)$

  • A
    $(4, 5)$
  • B
    $(1, 3)$
  • C
    $(3, 2)$
  • D
    $(7, 0)$

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