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3 1/8 - 1 5/12 =
25/8 - 17/12 =
75/24 - 34/24 =
41/24 = 1 17/24

[tex]3\frac{1}{8} - 1 \frac{5}{12} = \frac{25}{8} - \frac{17}{12} = \frac{75}{24} - \frac{34}{24} = \frac{41}{24} = 1\frac{17}{24} [/tex]