Question

Tìm x biết 

|x+2|=|3x-7|

Answer 1

Ta có : \(\left|x+2\right|\)= \(\left|3x-7\right|\)

              \(\Rightarrow\)x + 2 = 3x - 7

                 x - 3x = -2-7

                 -2x = -9

                     x =\(\frac{9}{2}\)

Answer 2

Ta có : \(\left|x+2\right|=\left|3x-7\right|\\ =>x+2=3x-7\\ =>x-3x=-7-2\\ =>-2x=-9\\ =>x=\frac{9}{2}\)