Question
$$-5x\cdot(4-2)\cdot5x+5 = 0$$
Answer
$$ \begin{matrix}x_1 = - \dfrac{\sqrt{ 10 }}{ 10 } & x_2 = \dfrac{\sqrt{ 10 }}{ 10 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} -5x\cdot(4-2)\cdot5x+5 &= 0&& \text{simplify left side} \\[1 em]-5x\cdot2\cdot5x+5 &= 0&& \\[1 em]-50x^2+5 &= 0&& \\[1 em] \end{aligned} $$
$ -50x^{2}+5 = 0 $ is a quadratic equation.
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