x + 1 36 -------- 2*x - 1 6
1 - 2*x 1 + x 6 *36
216
6.0^(1.0 - 2.0*x)*36.0^(1.0 + x)
1 - 2*x x + 1 6 *36
-2*x x 216*6 *36