A = (x² + 3x + 4x + 12) - (x² + 2x + 5x + 10)
A = (x² + 7x + 12) - (x² + 7x + 10)
A = x² + 7x + 12 - x² - 7x - 10
A = 2
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A = (x² + 3x + 4x + 12) - (x² + 2x + 5x + 10)
A = (x² + 7x + 12) - (x² + 7x + 10)
A = x² + 7x + 12 - x² - 7x - 10
A = 2