$$(-4 \frac{ 5 }{ 22 } )-(-2 \frac{ 6 }{ 11 } )$$
$-\frac{37}{22}\approx -1.681818182$
$$-\frac{88+5}{22}-\left(-\frac{2\times 11+6}{11}\right)$$
$$-\frac{93}{22}-\left(-\frac{2\times 11+6}{11}\right)$$
$$-\frac{93}{22}-\left(-\frac{22+6}{11}\right)$$
$$-\frac{93}{22}-\left(-\frac{28}{11}\right)$$
$$-\frac{93}{22}+\frac{28}{11}$$
$$-\frac{93}{22}+\frac{56}{22}$$
$$\frac{-93+56}{22}$$
$$-\frac{37}{22}$$
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$-\frac{37}{22} = -1\frac{15}{22} = -1.6818181818181819$
