(8 - $\dfrac{9}{4}$ + $\dfrac{2}{7}$ ) - (-6 - $\dfrac{3}{7}$ + $\dfrac{5}{4}$ ) - (3 + $\dfrac{2}{4}$ - $\dfrac{9}{7}$ )
`= 8 -` $\dfrac{9}{4}$ + $\dfrac{2}{7}$` + 6 `+ $\dfrac{3}{7}$ - $\dfrac{5}{4}$ - 3 - $\dfrac{2}{4}$ + $\dfrac{9}{7}$
`= ( 8 + 6 - 3)` + (- $\dfrac{9}{4}$ - $\dfrac{5}{4}$ - $\dfrac{2}{4}$ ) + ( $\dfrac{2}{7}$ +$\dfrac{3}{7}$ + $\dfrac{9}{7}$ )
`= 11 -` $\dfrac{16}{4}$ + $\dfrac{14}{7}$
`= 11 - 4 + 2`
`= 9`
