Question

Find the difference. Express your answer in simplest form. 7r/s - 4r/s

Answer 1

$7 \frac{r}{s} \: - 4 \frac{r}{s} \\ taking \: common \: factor \: ( \frac{r}{s} ) \\ = \frac{r}{s} (7 - 4) \\ =3 \frac{r}{s}$

Hope it helps...

Regards;

Leukonov/Olegion.