$$\frac{1}{4}+\frac{5}{6}-\frac{1}{12}$$
$1$
$$\frac{3}{12}+\frac{10}{12}-\frac{1}{12}$$
$$\frac{3+10}{12}-\frac{1}{12}$$
$$\frac{13}{12}-\frac{1}{12}$$
$$\frac{13-1}{12}$$
$$\frac{12}{12}$$
$$1$$
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