"x equals 0" is an equality, not an inequality. The question is, therefore, not consistent.
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Since it is an inequality, there is no way to solve for x. It equals all real numbers.
Suppose x3-4x = 0. To solve, factor: x3-4x = x(x2-4) = x(x+2)(x-2) = 0 Now, a product equals 0 if and only one or more of the factors equals 0, so set each factor to 0 and solve. The roots are 0,-2 and +2.
X = 1.8
x=2
2x(3x+6) = 0 x = 0 or x = -2