2 7*x + 11*x - 6 --------------- 2 9 - 49*x
(-6.0 + 7.0*x^2 + 11.0*x)/(9.0 - 49.0*x^2)
-6 + x*(11 + 7*x) ----------------- 2 9 - 49*x
-(2 + x) --------- 3 + 7*x
1 11 - - - --------- 7 21 + 49*x