решите уравнение x^2/(x^2-9)=(12-x)/(x^2-9)

Question

решите уравнение x^2/(x^2-9)=(12-x)/(x^2-9)

Answer 1

X^2 = 12-x (x#3;-3)
x^2 + x - 12=0
x= -1 +- 7 / 2 = -4; 3
OTB: x=-4