$$\frac{ 5 }{ 5 } - \frac{ 7 }{ 10 }$$
$\frac{3}{10}=0.3$
$$1-\frac{7}{10}$$
$$\frac{10}{10}-\frac{7}{10}$$
$$\frac{10-7}{10}$$
$$\frac{3}{10}$$
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$\frac{3}{2 \cdot 5} = 0.3$