solving05

Verified answer

Ответ:

Объяснение:

[tex]\frac{2x-14}{x^2-10x+21}=\frac{2(x-7)}{(x-7)(x-3)}=\frac{2}{(x-3)};\\x=2,8; \frac{2}{x-3}=\frac{2}{2,8-3}=\frac{2}{-0,2}=-10[/tex]