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b. n = -10 + 9 - 5 = -6
c. n = 8 - 21 + 10 = -3
d. n = -7 + 14 + 20 = 27
(maaf kalau salah)
n = - 8 + 3 = - 5
b) - n + 9 - 5 = 10
- n + 4 = 10
- n = 10 - 4 = 6
c) 8 - 21 + 10 = n
- 3 = n
d) - 7 + 14 + 20 = n
27 = n