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2x² - 8x² + 25y² + 5y² - 7x
-6x² + 30y² - 7x
2. (3x + 5y) (4x + 3y)
12x² + 9xy + 20xy + 15y²
12x² + 29xy + 15y²
3. saya kurang mengerti soalnya
4. soalnya nggak jelas tanda kurungnya cuma satu
5. (x + a) (a + b + c)
ax + bx + cx + a² + ab + ac