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x+3 (x-6) = x2 - 6x + 3x - 18 = x2 - 3x -18
2x+7 (x2-3x-18) = 2x3 - 6x2 - 36x + 7x2 - 21x - 126 = 2x3 + x2 - 57x - 126
6-x : 2x3 + x2 - 57x - 126 atau -x+6 : 2x3 +x2 -57x -126 = -2x2 - 13x - 21