[tex]1 - \frac{2 - x}{3} = \frac{x}{4} [/tex]
[tex]12 - 4(2 - x) = 3x[/tex]
[tex]12 - 8 + 4x = 3x[/tex]
[tex]x = - 4[/tex]
[tex]1 - \frac{2-x}{3} = \frac{x}{4} \ \ /\cdot12\\\\12-4(2-x) = 3x\\\\12-8+4x-3x = 0\\\\x+4 = 0\\\\x = -4[/tex]