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Pengurangan a dari b ialah b - a
-3a + 4b - 6c - (4a - 5b + c)
= -3a +4b - 6c -4a +5b - c
= -7a +9b - 7c
(3x - 2)(4x + 7)
= 12x² + 21x - 8x - 14
= 12x² +13x - 14