Explicación paso a paso:
[tex] \frac{7}{2x} + \frac{99}{3x} = 500 \\ \\ \frac{21 + 198}{6x } = 500 \\ \\ 219 = 500×(6x) \\ \\ \\ 219=3000x\\ \\ x= \frac{-219}{-3000} \\ \\ x= \frac{73}{1000} \\ \\ x = 0.073[/tex]
