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10 - 1 / -2 - 1 = 10 - d / -2 - 3
9 / -3 = 10 - d / -5
dikali silang
-3(10 - d) = 9 x -5
-30 + 3d = -45
3d = -45 + 30
d = -15/3
d = -5
jadi nilai d= -5