Question

what number should be added to minus 4 upon 7 to get 5 upon 9​

Answer 1

$let \: the \: no \: be \: x \: \: then\\ \frac{ - 4}{7} + x = \frac{5}{9} \\ x = \frac{5}{9} + \frac{4}{7} \\ x = \frac{35 + 36}{63} \\ x = \frac{71}{63}$