5/7-1/2÷3/28-1.75
=5/7-1/2x28/3-1.75
=5/7-14/3-7/4
=60/84-392/84-147/84
=(60-392-147)/84
=-479/84
5/7-1/2÷3/28-1.75=5/7-14/3-1.75=-83/21-1.75=-5.702381
