f(x) = (-10607 / 5408000000 * x^(3)) - (44151 / 270400000 * x^(2)) + (4166937 / 54080000 * x) + 8433473 / 1352000
g(x) = (-0.000002 * x^(3)) - (0.00016 * x^(2)) + (0.077 * x) + 6.24
g1(x) = g'(x)
g2(x) = g''(x)
l2 = NSolve(g1(x) = 0)
l1 = NSolve(g2(x) = 0)