Tolong donggg jawab pleaseee

39. 15+(-42) = 31-n
-27 = 31-n
n = 31-(-27)
n = 58 C

40. n+(-19) = 15-48
n+(-19) = -33
n = -33 + 19
n = -24 A

41. A
42. C
43. B

maaf kalau salah ya