09 Íàéäèòå êîðåíü óðàâíåíèÿ `^`(`/`(1, 5), `+`(21, `-`(`*`(2, `*`(x))))) = `^`(25, `+`(`*`(3, `*`(x)), 7)).  

ÐÅØÅÍÈÅ 

 

ÎÒÂÅÒ 

-8.75