[ (x+3) / (x² - 9) + x / (6+x - x²) ] * (3-x) / (4x - 6)= [ 1/(x-3) - x / (x+2)(x-3) ] * (3-x) / (4x - 6)= 2 / [(x+2)(x-3) ] * (3- x) / [ 2(2x - 3)]= - 1 / [ (x+2) (2x - 3) ]