3 1 2 - - 3 - x + 15*-*2 - 9 - - x x x
3/x - 1*3 - x + 15*2/x - 1*9 - 2/x
31 -12 - x + -- x
31 + x*(-12 - x) ---------------- x
(31 + x*(-12 - x))/x
/ 2 \ -\-31 + x + 12*x/ ------------------- x
-(-31 + x^2 + 12*x)/x
2 31 - x - 12*x -------------- x
(31 - x^2 - 12*x)/x