Вычислите 5+2 1/3 / (-9.8)- 5 / (-21)=

1) 2 1/3 : (-9,8) = 7/3 : (-98/10) = 7/3 * (-10/98) = -10/42
2) 5 : (-21) = -5/21
3) 5 + (-10/42) = 5/1 - 10/24 = 210/42 - 10/42 = 200/42
4) 200/42 + 5/21 = 200/42 + 10/42 = 210/42 = 5