` x^2 - \frac{5}{14} .x = 0`
`<=> x . x - \frac{5}{15} . x = 0`
`<=> x ( x - \frac{5}{14} ) = 0`
`<=>` \(\left[ \begin{array}{l}x=0\\x - \frac{5}{14} = 0 \end{array} \right.\)`
`<=>` \(\left[ \begin{array}{l}x=0\\x=\frac{5}{14}\end{array} \right.\)`
`\text{Vậy :}` `\(\left[ \begin{array}{l}x=0\\x=\frac{5}{14}\end{array} \right.\)`
