`6/7 : ( 1/2 × 3/4 ) - 1/8`
`= 6/7 : 3/8 -1/8`
`= 6/7 xx 8/3 -1/8`
`= 48/21 -1/8`
`= 16/7 -1/8`
`= 121/56`
\(\dfrac{6}{7}:\left(\dfrac{1}{2}.\dfrac{3}{4}\right)-\dfrac{1}{8}\)
\(=\dfrac{6}{7}:\dfrac{3}{8}-\dfrac{1}{8}\)
\(=\dfrac{16}{7}-\dfrac{1}{8}\)
\(=\dfrac{128}{56}-\dfrac{7}{56}\)
\(=\dfrac{121}{56}\)