(1 3/7+10/3)÷(12 1/3 - 14 2/7) решить

(1 3/7 + 10/3) : (12 1/3 - 14 2/7) = -2 18/41
1) 1 3/7 + 10/3 = 10/7 + 10/3 = (30 + 70)/21 = 100/21
2) 12 1/3 - 14 2/7 = -(14 2/7 - 12 1/3) = - (14 6/21 - 12 7/21) = -(13 27/21 - 12 7/21) = -1 20/21 = -41/21
3) 100/21 : (-41/21) = -100/41 = -2 18/41