40/143-41/156 43/126-41/135
40/143 - 41/156 = (40*12 - 41 * 11)/143 * 156 = (480 - 451) / 143*156 = 29 / 143*156 = 29/22308
43/126 - 41/135 = (43*15 - 41 * 14)/126*135 = (645 - 574) / 126*135 =
40/143-41/156=(480-451)/1716=31/1716 43/126-41/135=(645-574)/1890=71/1890