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# maaf y kalau slh:)
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beda = 0, 2, -3, 9, 5, -6, a, b
(setiap urutan minus berarti dikali 2)
-3 × 2 = (-6)
-6 × 2 = -12 (b)
= 0, 2, -3, 9, 5, (-6), a, -12
karena a -12 = 54
a = 54 + 12
a = 66
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