Oddman answered It is a tautology, meaning it is true for all values of x. It is a linear equation with an infinite number of solutions.The left side expands to 4x + (-2*3) + (-2*2x) = 4x - 6 - 4x = x(4 - 4) - 6 = 0x - 6 = -6Of course, the right side is also -6.