Question

7x-5=13-5x

Answer 1

\(\Leftrightarrow7x+5x=13+5\)

\(\Leftrightarrow12x=18\)

\(\Leftrightarrow x=\dfrac{3}{2}\)

Vay..

Answer 2

Ta có: 7x-5=13-5x

\(\Leftrightarrow7x+5x=13+5\)

\(\Leftrightarrow12x=18\)

hay \(x=\dfrac{3}{2}\)

Vậy: \(S=\left\{\dfrac{3}{2}\right\}\)