$$\frac{1}{9}m^2-196 = 0$$
Answer
$$ \begin{matrix}m_1 = 42 & m_2 = -42 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} \frac{1}{9}m^2-196 &= 0&& \text{multiply ALL terms by } \color{blue}{ 9 }. \\[1 em]9 \cdot \frac{1}{9}m^2-9\cdot196 &= 9\cdot0&& \text{cancel out the denominators} \\[1 em]m^2-1764 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-1764 = 0 $ is a quadratic equation.
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