The calculation of [1 - (1 / 4 + 3 / 8)] / 1 / 4 can be simplified and must be simplified

The calculation of [1 - (1 / 4 + 3 / 8)] / 1 / 4 can be simplified and must be simplified

={1-(2/8+3/8)}/1/4
=(1-5/8)/2/8
=3/8/2/8
=3/2