(2^2+x)/(4+3x)=(-8)^{-2}*x+1
(4 + x)/(4 + 3x) = 1/64 * x + 1       | * 64 (4+3x)
64(4+x) = x(4+3x) + 64(4+3x)
64*4 + 64*x = 4x + 3x^2 + 64*4 + 64*3x  | - 64*4
 64*x = 4x + 3x^2  + 64*3x   | -4x
 60*x = 3x^2  + 64*3x   | : 3
20x = x^2 + 64x
0 = x^2 + 44x       | x ausklammern
0 = x(x+44)
x1 = 0
x2 = -44