(1/8+2/9-1/4)×51/7÷(7/9-2/3+1/6)=?

Question

(1/8+2/9-1/4)×51/7÷(7/9-2/3+1/6)=?

Answer 1

1)9/72+16/72-18/72=7/72
2)7/72*51/7=51/72
3)14/18-12/18+3/18=5/18
4)51/72:5/18=51/72*18/5=51/20=2 11/20
ответ 2 11/20