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A = 2x² + 5x
B = 3x(4-x)
B = 12x - 3x²
Nilai A - B
= (2x² + 5x) - (12x - 3x²)
= 2x² + 5x - 12x + 3x²
= 2x² + 3x² + 5x - 12x
= 5x² - 7x