3 3*|x|*(x - 3) - x
(3*|x|)*(x - 3) - x^3
2 - 3*x + 3*|x| + 3*(x - 3)*sign(x)
6*(-x + (-3 + x)*DiracDelta(x) + sign(x))
6*(-1 + 3*DiracDelta(x) + (-3 + x)*DiracDelta(x, 1))