What is the sum of the roots of the equation 4x^3 + 5x^2 - 8x = 3x^3 - x^2 + 12x? Express your answer as a decimal to the nearest hundredth.
Rearrange as
x^3 + 6x^2 - 20x = 0
We have the form ax^3 + bx^2 + cx + d
Sum of the roots = -b/ a = -6/1 = -6