$$6x^2 = -12x$$
Answer
$$ \begin{matrix}x_1 = 0 & x_2 = -2 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 6x^2 &= -12x&& \text{move all terms to the left hand side } \\[1 em]6x^2+12x &= 0&& \\[1 em] \end{aligned} $$
In order to solve $ \color{blue}{ 6x^{2}+12x = 0 } $, first we need to factor our $ x $.
$$ 6x^{2}+12x = x \left( 6x+12 \right) $$$ x = 0 $ is a root of multiplicity $ 1 $.
The second root can be found by solving equation $ 6x+12 = 0$.
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