x - 3x(1+12x) = 11 - (5 - 6x)(6x + 5),
x - 3x-36x^2 = 11 - (30x - 36x^2 - 30x + 25),
-2x - 36x^2 = 11 - 30x + 36x^2 + 30x - 25,
-2x -36x^2 -11 + 30x - 36X^2 - 30x + 25 = 0,
-72x^2 - 2x + 14 = 0,
D = (-2)^2 - 4*(-72)*14 = 4036
= 63,53
x1 = (2 + 63,53)/(-2*72) = - 0,4551
x2 = (2 - 63,53)/(-2*72) = 0,4273