$$\frac{11}{15}+\frac{3}{30}-\frac{2}{15}$$
$\frac{7}{10}=0.7$
$$\frac{11}{15}+\frac{1}{10}-\frac{2}{15}$$
$$\frac{22}{30}+\frac{3}{30}-\frac{2}{15}$$
$$\frac{22+3}{30}-\frac{2}{15}$$
$$\frac{25}{30}-\frac{2}{15}$$
$$\frac{5}{6}-\frac{2}{15}$$
$$\frac{25}{30}-\frac{4}{30}$$
$$\frac{25-4}{30}$$
$$\frac{21}{30}$$
$$\frac{7}{10}$$
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$\frac{7}{2 \cdot 5} = 0.7$
