$$22 \frac { 9 } { 17 } - 72 \frac { 16 } { 17 }$$
$-\frac{857}{17}\approx -50.411764706$
$$\frac{374+9}{17}-\frac{72\times 17+16}{17}$$
$$\frac{383}{17}-\frac{72\times 17+16}{17}$$
$$\frac{383}{17}-\frac{1224+16}{17}$$
$$\frac{383}{17}-\frac{1240}{17}$$
$$\frac{383-1240}{17}$$
$$-\frac{857}{17}$$
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$-\frac{857}{17} = -50\frac{7}{17} = -50.411764705882355$