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= x^3 - x^2 + 7x | batas 3 sampai 4
= (4^3 - 4^2 + 7(4)) - (3^3 - 3^2 + 7(3))
= (64 - 16 + 28) - (27 - 9 + 21)
= 76 - 39
= 37