log₃(x²-3) = log₃(2x)
x² - 3 = 2x
x² - 2x - 3 = 0
D = 4 - 4 ·1 · (-3) = 16
x₁ = 2 + 4 / 2 = 3
x₂ = 2 - 4 / 2 = -1