$$3\frac{4}{6}-3\frac{5}{7}$$
$-\frac{1}{21}\approx -0.047619048$
$$\frac{18+4}{6}-\frac{3\times 7+5}{7}$$
$$\frac{22}{6}-\frac{3\times 7+5}{7}$$
$$\frac{11}{3}-\frac{3\times 7+5}{7}$$
$$\frac{11}{3}-\frac{21+5}{7}$$
$$\frac{11}{3}-\frac{26}{7}$$
$$\frac{77}{21}-\frac{78}{21}$$
$$\frac{77-78}{21}$$
$$-\frac{1}{21}$$
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$-\frac{1}{21} = -0.047619047619047616$
