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Aljabar.Operasikan dengan suku yang sejenis!
15x² - 3xy + 6² - 18² + 5xy + 2y²
= 15x² + 2y² + 2xy - 288
= 15x^2 - 3xy + 5xy + 36 - 324 + 2y^2
= 15x^2 + 2xy - 288 + 2y^2