x - 1 ------- 2*x + 3
(x - 1)/(2*x + 3)
1/2 - 5/(2*(3 + 2*x))
1 5 - - ----------- 2 2*(3 + 2*x)
(-1.0 + x)/(3.0 + 2.0*x)
1 5 - - ------- 2 6 + 4*x
1/2 - 5/(6 + 4*x)