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= (2x)(-2y) + (2x)(3x) - (2x)(3)
= - 4xy + 6x² - 6x
dikalikan ke dalam jadinya,
-4xy + 6x kuadrat - 6×
biar depan nya ilang tanda - maka semua nya di kali negatif (-)
jd jwbnya 4xy - 6x kuadrat + 6x