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semua dikali 2x^2
= (2x^4 + 8x^3 - 12 + 18x^3 - 38x^2)/ 2x^2
= (2x^4 + 26x^3 - 36x^2 - 12)/ 2x^2
= 2x^2 (x^2 + 13x - 18) - 6/x^2