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Ответ:

[tex] \frac{1}{12} x - \frac{1}{2} x = \frac{1 - 6}{12} x = - \frac{5}{12 } x\\ - \frac{5}{12}x + \frac{1}{4} //x = - \frac{5 + 3}{12}//x = - \frac{8}{12}// x = - \frac{2}{3} x[/tex]