Question
$$0 = -5x^2+19\cdot5x$$
Answer
$$ \begin{matrix}x_1 = 0 & x_2 = 19 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 0 &= -5x^2+19\cdot5x&& \text{move all terms to the left hand side } \\[1 em]0+5x^2-95x &= 0&& \text{simplify left side} \\[1 em]5x^2-95x &= 0&& \\[1 em] \end{aligned} $$
In order to solve $ \color{blue}{ 5x^{2}-95x = 0 } $, first we need to factor our $ x $.
$$ 5x^{2}-95x = x \left( 5x-95 \right) $$$ x = 0 $ is a root of multiplicity $ 1 $.
The second root can be found by solving equation $ 5x-95 = 0$.
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