Сократите дробь 2x^2-5x-3/3-x

(2x² - 5x - 3)/(3 - x) = (2x² - 6x + x - 3)/(3 - x) = [2x(x - 3) + (x - 3)]/(3 - x) = 
-(2x + 1)(x - 3)/(x - 3) = -(2x + 1) = -2x - 1.