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Ответ:

[tex]3) - x - 11 \frac{1}{2} = - 4 \frac{7}{8} [/tex]

[tex] - x - \frac{ 23}{2} = - \frac{39}{8} [/tex]

[tex] - x = - \frac{39}{8} + \frac{23}{2} [/tex]

[tex] - x = \frac{53}{8} [/tex]

[tex] - x = - \frac{53}{8} [/tex]