3/4-1/6=9/12-2/12=7/125/7-3/8=5*8/56-3*7/56=19/562/3-4/9=2*3/9-4/9=2/9
3/4-1/6=3X3/4X3-1X2/6X2=7/125/7-3/8=5X8/7X8-3X7/8X7=19/562/3-4/9=2X3/3X3-4/9=2/9