Verified answer

[tex]5x + 3 = 6 - 7x[/tex]

[tex]5x + 3 + 7x = 6[/tex]

[tex]5x + 7x = 6 - 3[/tex]

[tex]12x = 3[/tex]

[tex]x = \frac{3}{12} [/tex]

Сократим на 3

[tex]x = \frac{1}{4} [/tex]