[tex]x - 3 \frac{7}{12} = - 3 \frac{2}{3} \\ x = - 3 \frac{2}{3} + 3 \frac{7}{12} \\ x = - 3 \frac{8}{12} + 3 \frac{7}{12} \\ x = - \frac{1}{12} [/tex]