$$3x(3x+7) = 0$$
Answer
$$ \begin{matrix}x_1 = 0 & x_2 = -\dfrac{ 7 }{ 3 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 3x(3x+7) &= 0&& \text{simplify left side} \\[1 em]9x^2+21x &= 0&& \\[1 em] \end{aligned} $$
In order to solve $ \color{blue}{ 9x^{2}+21x = 0 } $, first we need to factor our $ x $.
$$ 9x^{2}+21x = x \left( 9x+21 \right) $$$ x = 0 $ is a root of multiplicity $ 1 $.
The second root can be found by solving equation $ 9x+21 = 0$.
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