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x - 2xy + 1/2x - 1/3xy = 1 1/2 x - 2 1/3 xy
-x² + y² - 2x² - 2y²= - 3x² - y²
-x² + 2x - 3x + x² = - x
4x + 4 - 7x - 1/2= - 3x + 3 1/2
-2ab + 12a -4ab - 16a = - 4a - 6ab