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= 6x² + 4xy - 4x - 9x - 6y + 6
= 6x² + 4xy - 13x - 6y + 6
Perkalian silang, 2x * 3x, 2x * 2y, 2x * -2, -3 * 3x, -3 * 2y, -3 * -2