The sum of two rational numbers is -5. If one of them -14/5, find the other.

let the first no. be A
let the second no. B
therefore,the sum of digits= A+B
=>A+B= -5
=>A+-14/5= -5
=>A-14/5= -5
=>A= -5+14/5
=>A= -25+14/5
=>A= -11/5