Respuesta :
Explicación paso a paso:
[tex]a - b = 30 \: \: \: \: \frac{a}{b} = \frac{7x}{2x} \\ 7x - 2x = 30 \\ 5x = 30 \\ x = 6 \\ \\ a = 7x = 7 \times 6 = 42 \\ b = 2x = 2 \times 6 = 12[/tex]
Explicación paso a paso:
[tex]a - b = 30 \: \: \: \: \frac{a}{b} = \frac{7x}{2x} \\ 7x - 2x = 30 \\ 5x = 30 \\ x = 6 \\ \\ a = 7x = 7 \times 6 = 42 \\ b = 2x = 2 \times 6 = 12[/tex]