$$\frac { - 3 } { 11 } - ( \frac { - 4 } { 77 } )$$
$-\frac{17}{77}\approx -0.220779221$
$$-\frac{3}{11}-\frac{-4}{77}$$
$$-\frac{3}{11}-\left(-\frac{4}{77}\right)$$
$$-\frac{3}{11}+\frac{4}{77}$$
$$-\frac{21}{77}+\frac{4}{77}$$
$$\frac{-21+4}{77}$$
$$-\frac{17}{77}$$
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$-\frac{17}{77} = -0.22077922077922077$
