Question

Помогите плиз
Очень надо

Answer 1

1/(х+8) + 1/(х+18) = 1/х
(х+8 + х+18)/(х+8)(х+18) = 1/х
(2х + 26)/(х^2+26х+144) = 1/х
2х^2 + 26х = х^2+26х+144
х^2 = 144
х = 12