Раскроем скобки: $19\frac{28}{34} - m - 2\frac{29}{34} = 12\frac{15}{34}$.
$19\frac{28}{34} - 2\frac{29}{34} - m = 12\frac{15}{34}$.
$16\frac{33}{34} - m = 12\frac{15}{34}$.
$m = 16\frac{33}{34} - 12\frac{15}{34} = 4\frac{18}{34} = 4\frac{9}{17}$
Ответ: $m = 4\frac{9}{17}$
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