Question

What should be added to 7/15 to get -3/8

Answer 1

x+7/15=-3/8
x= -3/8-7/15
x=-45-56/120
x=-109/120

Answer 2

let the no. added be x then:
7/15+x = -3/8
x = -3/8-7/15
= -45-56/120
x = -109/120
so the number which is added is -109/120