$$\frac{ 1 }{ 7 } - \frac{ 21 }{ 1 }$$
$-\frac{146}{7}\approx -20.857142857$
$$\frac{1}{7}-21$$
$$\frac{1}{7}-\frac{147}{7}$$
$$\frac{1-147}{7}$$
$$-\frac{146}{7}$$
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$-\frac{146}{7} = -20\frac{6}{7} = -20.857142857142858$
