nastisecret

4/5÷2 2/3-3:3/4 / 1/6 - 1/15 = 4/5×3/8-4 / 1/10 = 1/5×3/2-4 / 1/10 = 3/10-4 / 1/10 =

-37/10 / 1/10 = -37/1 = -37.