Question

the sum of the two rational number is -3 if one of the number is minus 7 by 5 then the other number is​

Answer 1

Let the other number be x

According to the question

$\frac{ - 7}{5} + x = - 3 \\ \frac{ - 7 + 5x}{ 5} = - 3 \\ - 7 + 5x = - 15 \\ 5x = - 15 + 7\\ 5x = - 8 \\ x = \frac{ - 8}{5}$