(х2 + 4х)/(х – 3) – (4х + 9)/(х – 3) = 0
(х2+4х)-(4х+9)/(х-3)=0 Х2+4х-4х-9/х-3=0 Х2-9/х-3=0 Х2-9=0 (х-3)(х+3)=0 Х-3=0 х+3=0 Х=3; -3