1-5/6+7/8-11/21-3-1/7*33/35

1 - 5/6 + 7/8 - 11/21 - 3 - (1/7 * 33/35) = 1 - 5/6 + 7/8 - 11/21 - 3 - 33/245 = (1 - 3) - 5/6 + 7/8 - 11/21 - 33/245 = -2 - 5/6 + 7/8 - 11/21 - 33/245 = -2 - (700 + 1890 - 1540 - 132) / 840 = -2 - 1618/840 = -2 - 1.926... = -3.926...