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2) 81 - 108y + 108y - 144y² = 81 - 144y²
3) 20y² - 16y -15y + 12 = 20y² - 31y +12
4) 6y² + 21y - 8y - 28 = 6y² 13y - 28
5) 3x² - 15x + 2x - 10 = 3x² -13x - 10
Maaf klo ada salah hitung..