5+2 1/3:(-9.8)-5:(-21

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

1) 2 1/3 : (-9,8) = -7/3 * 5/49 = -5/21
2) -5 : (-21) = 5/21
3) 5 - 5/21 + 5/21 = 5