Tìm x: X(x – 2) – x + 2 = 0

X(x – 2) – x + 2 = 0

X^2 ( x^2 + 1) – X^2 – 1 = 0

5x(x – 3)^2 – 5(x – 1)^3 + 15(x + 2)(x – 2) = 5