1 3/7 *(-7/10)-4 2/5 : 2 1/5=

1 3/7 *(-7/10)-4 2/5 : 2 1/5 = 10/7 * (-7/10) - 22/5 : 11/5 = 10/7 * (-7/10) - 22/5 * 5/11 = -1 - 2 = -3