((7/8-5/9)×3/7):(13/44-2/33)×2​

1) (7/8 - 5/9)*3/7 = 3/8 - 5/21= 63/168 - 40/168 = 23/168

2) (13/44 - 2/33)*2= 13/22 - 4/33 = 39/66 - 8/66 = 31/66

3) 23/168 : 31/66 = 23/168 * 66/31 = 23/28 * 11/31 = 253/868