Ответ:

5х-11=2х+7

5х-2х=7+11

3х=18

х=18/3=6

х=6

[tex]5x - 11 = 2x + 7 \\ 5x - 2x = 7 + 11 \\ 3x = 18 \\ x = \frac{18}{3} \\ x = 6[/tex]