Срочно!!!!
х-4/х-3+6/х^2-9=4/5

Ответ:

(x^2 - 3x - 12 + 6)/(x^2 - 9) = 4/5

x^2 - 3x - 6 = 4x - 20

x^2 - 7x + 14 = 0

x1 = 7 + √(7^2 - 4*14) / 2

x1 = 7 + √49 / 2

x1 = 7 + 7 / 2

x1 = 7

x2 = 7 - √(7^2 - 4*14) / 2

x2 = 7 - 7 / 2

x2 = 7