What number should be added to `-(5)/7` to get `-(2)/3?`

Which rational number should be added to (-5)/(9) to get (-2)/(3) ?

What number should be added to (-5)/8 so as to get 5/9 ?

What number should be added to (-7)/8 so as to get 5/9?

What number should be added to (-7)/8 so as to get 5/9?

What should be added to 5 3/7 to get 12?

What number should be added to (-5)/8 so as to get 5/9\ ?

What should be added to -5/6 to get -2/3 ?

Which rational number should be added to (-7)/(8) to get (5)/(9) ?

(i) What number should be added to 5/12 to get 2""3/8 ? (ii) What number should be subtracted from 5 to get 1""5/13 ?

What should be added to 5 4/(15) to get 12 3/5?