Question

What number should be added to -4/7 to get 5/9

Answer 1

-4/7 + x = 5/9
x = 5/9 - -4/7
x = 35/63 - -36/63
x = 69/63

Answer 2

-4/7+x=5/9
x=5/9+4/7
x=71/63
71/63 must be added to -4/7 to get 5/9.
Hope it helps.