-5 + -4 =
-5 - 4 = -9
3 + -28 : 7 - -3 × 2 =
3 + -4 - -6 =
3 - 4 + 6 = 5
13 + 2 × -3 + 27 : 9 =
13 + -6 + 3 =
13 - 6 + 3 = 10
(13 + 2) × -3 + 27 : 9 =
15 × -3 + 3 =
-45 + 3 = -42