Explicación paso a paso:
[tex] \frac{2}{5} + \frac{3}{7} = \frac{14 + 15}{35} = \frac{29}{35 } \\ \frac{8}{3} - \frac{29}{35} = \frac{8 \times 35 - 3 \times 29}{3 \times 35} = \frac{280 - 87}{105} \\ \frac{193}{105} = cantidad \: que \: compro \: sara[/tex]
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Explicación paso a paso:
[tex] \frac{2}{5} + \frac{3}{7} = \frac{14 + 15}{35} = \frac{29}{35 } \\ \frac{8}{3} - \frac{29}{35} = \frac{8 \times 35 - 3 \times 29}{3 \times 35} = \frac{280 - 87}{105} \\ \frac{193}{105} = cantidad \: que \: compro \: sara[/tex]