$$\frac { - 11 } { 14 } - ( \frac { 1 } { 21 } ) ^ { d o }$$
$\frac{-14\times \left(\frac{1}{21}\right)^{do}-11}{14}$
$$\frac{-11-14\times \left(\frac{1}{21}\right)^{do}}{14}$$
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$-\left(\frac{1}{21}\right)^{do}-\frac{11}{14}$
