=(-5/6)÷[-(3+ 1/6)]÷{ 1/24×[-( 1+ 1/4)]}- 1/4÷ 1/4
=(-5/6)÷(- 19/3)÷[ 1/24×(-5/4)]- 1
=5/6×3/ 19÷(-5/96)- 1
=-5/6×3/ 19×96/5- 1
=-48/ 19- 1
=-67/ 19
I hope I can help you and wish you progress in your study.