a) (7x - y) - (4x - 2y) = 7x - y - 4x + 2y = 3x + y
b) 2x(3x - 4) + x(5 - 2x) = 6x² - 8x + 5x - 2x² = 4x² - 3x
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a) (7x - y) - (4x - 2y) = 7x - y - 4x + 2y = 3x + y
b) 2x(3x - 4) + x(5 - 2x) = 6x² - 8x + 5x - 2x² = 4x² - 3x