Question

Найдите корень уравнения 7/x+8=-1

Answer 1

$\displaystyle \frac{7}{x+8}=-1$

$\displaystyle 7=-1(x+8) 7=-x-8 7+8=-x 15=-x x=-15$


или

$\displaystyle \frac{7}{x}+8=-1$

$\displaystyle \frac{7}{x}=-9$

$\displaystyle 7=-9x$

$\displaystyle x=- \frac{7}{9}$