Question

7x-5=13-5x

Answer 1

Ta có: 7x-5=13-5x

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

\(\Leftrightarrow12x=18\)

hay \(x=\dfrac{3}{2}\)

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

Answer 2

         7x - 5 = 13 - 5x

<=> 7x + 5x = 13 + 5

,<=> 12x = 18

,<=> x = \(\dfrac{12}{18}=\dfrac{2}{3}\)

Vậy phương trình có nghiệm : S = { \(\dfrac{2}{3}\)}