15 + (−7) = (1)

−12 + 25 = (2)

38 + (−19) = (3)

−45 + 30 = (4)

27 + (−32) = (5)

−18 + 14 = (6)

49 + (−28) = (7)

−33 + 56 = (8)

72 + (−41) = (9)

−25 + 17 = (10)

−48 + 39 = (11)

66 + (−22) = (12)

−14 + 9 = (13)

58 + (−37) = (14)

−29 + 44 = (15)

31 + (−18) = (16)

−50 + 26 = (17)

24 + (−15) = (18)

−36 + 27 = (19)

63 + (−42) = (20)