[tex]x - 3x + \frac{1}{4} = \frac{1}{3} \: \: | \times 12 \\ 12 \times x - 12 \times 3x + 12 \times \frac{1}{4} = 12 \frac{1}{3} \\ 12x - 36x + 3 = 4 \\ - 24x = 4 - 3 \\ - 24x = 1 \: \: | \div ( - 24) \\ x = - \frac{1}{24} [/tex]
