3*c + 1 ------- + c c - 1 ----------- c + 1
(c + (1.0 + 3.0*c)/(-1.0 + c))/(1.0 + c)
1 + 3*c + c*(-1 + c) -------------------- (1 + c)*(-1 + c)
1 + c ------ -1 + c
2 1 + ------ -1 + c