Question

What should be added to twice the rational number -7by3 to get 3by7

Answer 1

let the number be x.

according to the question,2(-7 by 3) + a by b=3 by 7=-14 by 3 + a by b=3 by 7=a by b=3 by 7+14 by 3=a by b=107 by 21.