$$\frac{13}{5}-\frac{9}{10}$$
$\frac{17}{10}=1.7$
$$\frac{26}{10}-\frac{9}{10}$$
$$\frac{26-9}{10}$$
$$\frac{17}{10}$$
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$\frac{17}{2 \cdot 5} = 1\frac{7}{10} = 1.7$