Question

what should be added to 13 by 14 to get minus -5 by 21​

Answer 1

let the unknown number be "x"

$\frac{13}{14} + x = - \frac{5}{21}$

$x = - \frac{5}{21} - \frac{13}{14} \\ x = \frac{ - 10 - 39}{42} \\ x = - \frac{49}{42}$

Answer 2

Answer:

let the number be x

According to Question

13/14+x = -5/21

13+14x/14 = -5/21

273+294x = -70

294x = -70-273

294x = -343

x = -343/294

x = -7/6