Question

Tìm x : \(\frac{x-9}{x+7}\)= \(\frac{7}{9}\)

Answer 1

\(\frac{x-9}{x+7}=\frac{7}{9}\)

\(\Leftrightarrow\left(x-9\right)\times9=7\times\left(x+7\right)\)

\(\Leftrightarrow9x-81=49+7x\)

\(\Leftrightarrow9x-7x=49+81\)

\(\Leftrightarrow2x=130\)

\(\Leftrightarrow x=65\)

Answer 2

x=65 nha bạn

Answer 3

nhân chéo rồi rút gọn nha

Answer 4

\(\frac{x-9}{x+7}=\frac{16-9}{2+7}\frac{7}{9}\)