\(\dfrac{31}{23}-\left(\dfrac{7}{32}+\dfrac{8}{23}\right)\\ =\dfrac{31}{23}-\dfrac{7}{32}-\dfrac{8}{23}\\ =\left(\dfrac{31}{23}-\dfrac{8}{23}\right)-\dfrac{7}{32}\\ =\dfrac{23}{23}-\dfrac{7}{32}\\ =1-\dfrac{7}{32}\\ =\dfrac{32-7}{32}\\ =\dfrac{25}{32}\)
31/23 - (7/32 + 8/23)
= 31/23 - 8/23 - 7/32
= 1 - 7/32
= 25/32
`31/23 -(7/32 + 8/23)`
`= 31/23 -7/32 - 8/23`
`=( 31/23 -8/23)-7/32`
`= 23/23- 7/32`
`= 1-7/32`
`=32/32 -7/32`
`= 25/32`