$$x^2-70 \cdot \frac{x}{100}-\frac{30}{100} = 0$$
Answer
$$ \begin{matrix}x_1 = 1 & x_2 = -\dfrac{ 3 }{ 10 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2-70 \cdot \frac{x}{100}-\frac{30}{100} &= 0&& \text{multiply ALL terms by } \color{blue}{ 100 }. \\[1 em]100x^2-100\cdot70 \cdot \frac{x}{100}-100\cdot\frac{30}{100} &= 100\cdot0&& \text{cancel out the denominators} \\[1 em]100x^2-70x-30 &= 0&& \\[1 em] \end{aligned} $$
$ 100x^{2}-70x-30 = 0 $ is a quadratic equation.
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