Verified answer

[tex]3 \times (7 - 2x) = 13 + 2x \\ 21 - 6x = 1 3 + 2 \\ 21 - 6x = 15 \\ - 6x = 15 - 21 \\ - 6x = - 6 \\ x = 1[/tex]

Ответ:

3×(7-2х)=13+2х

21-6х=13+2х

-6х-2х=13-21

-8х=-8

х=1