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hasil pengurangan 3x² + 12xy - 3x dari 2x² - 2xy + 2x
= (2x² - 2xy + 2x) - (3x² + 12xy - 3x)
= 2x² - 2xy + 2x - 3x² - 12xy + 3x
= -x² - 14xy + 5x