$$\frac{40}{30}-\frac{3}{30}-\frac{2}{30}=1$$
$\text{false}$
$$\frac{4}{3}-\frac{3}{30}-\frac{2}{30}=1$$
$$\frac{4}{3}-\frac{1}{10}-\frac{2}{30}=1$$
$$\frac{40-3}{30}-\frac{2}{30}=1$$
$$\frac{37}{30}-\frac{2}{30}=1$$
$$\frac{37-2}{30}=1$$
$$\frac{35}{30}=1$$
$$\frac{7}{6}=1$$
$$\frac{7}{6}=\frac{6}{6}$$
$$\text{false}$$
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