$$4(3/5)-2(7/10)$$
$1$
$$\frac{4\times 3}{5}-2\times \frac{7}{10}$$
$$\frac{12}{5}-2\times \frac{7}{10}$$
$$\frac{12}{5}-\frac{2\times 7}{10}$$
$$\frac{12}{5}-\frac{14}{10}$$
$$\frac{12}{5}-\frac{7}{5}$$
$$\frac{12-7}{5}$$
$$\frac{5}{5}$$
$$1$$
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