Question

решите уравнение
$\frac{x + 8}{5x + 7 } = \frac{x + 8}{7x + 5}$

Answer 1

(x+8)(7x+5)=(x+8)(5x+7)

(x+8)(7x+5)-(x+(5x+7)=0

(x+8)(7x+5-5x-7)=0

(x+8)(2x-2)=0

(x+8)*2(x-1)=0

(x+8)(x-1)=0

x+8=0
x-1=0

x=-8
x=1

x1=-8
x2=1