Question

помогите, пожалуйста ​

Answer 1

$5x-\frac{2}{7}x^{2}=0\\\\5x*7-\frac{2}{7}x^{2}*7=0\\\\35x-2x^{2} =0\\\\x(35-2x)=0\\\\ \left[\begin{array}{ccc}x=0\\35-2x=0\end{array}\right\\\\\left[\begin{array}{ccc}x=0\\2x=35\end{array}\right\\\\\left[\begin{array}{ccc}x_{1}=0 \\x_{2}=17,5 \end{array}\right\\\\Otvet:\boxed{0;17,5}$