2/7+7/15÷7/6×15/14-3/4=

-1/28............…........

2/7 + 7/15 ÷ 7/6 × 15/14 - 3/4

#Operasi ÷ & ×
7/15 ÷ 7/6 = 7/15 × 6/7 = 42/105

42/105 × 15/14 = 630/1.470 = 63/147

#Operasi + & -
2/7 - 3/4 = 8/28 - 21/28 = -13/28

#Gabungan
63/147 - 13/28 = 252/588 - 273/588 = -21/588 = -1/28