4(3x+1) 3x+2 2x+3
--------------- = ----------- - -------------
(x-1)(x+3) x-1 x+3
4(3x+1)(x-1)(x+3) (3x-2)(x-1)(x+3) (2x+3)(x-1)(x+3)
-------------------------- = ------------------------ - ------------------------
(x-1)(x+3) x-1 x+3
4(3x+1)=(3x-2)(x+3)-(2x+3)(x-1)
12x+4=3x²+9x-2x-6-4x²+2x-3x+3
4+6-3=3x²-4x²+9x-2x+2x-3x-12x
7=-x²-18x
x²+18x=-7
x(x+18)=-7
x₁=-7 x₂+18=-7
x₂=-7/18 или х₂=-0,3889