Question

what should be added to twice the rational number - 7÷3 to get 3÷7

Answer 1

let it be x then
x+2* (-7/3)=3/7
⇒x-14/3=3/7
⇒x=14/3+3/7=107/21

Answer 2

x+2* (-7/3)=3/7
⇒x-14/3=3/7
⇒x=14/3+3/7
=107/21