Question

what should be added to -3 upon 13. so to get 5 upon 9

Answer 1

hello friend here is your answer
so x =92/117 will be added to -3/13 to get 5/9

Answer 2

Let required number be x,

Their sum = 5/9 
-3/13 + x    = 5/9 
            x    = 5/9 + 3/13               x     = (65 + 27)/117 
            x     = 92/117 



then,

92/117 should be added.