What is the value of $9$ $\dfrac{1}{5}$ $-$ $1$ $\dfrac{4}{5}$?
A. $7\dfrac{2}{5}$
B. $\dfrac{1}{2}$
C. $\dfrac{3}{2}$
D. $1$
E. $\dfrac{2}{1}$
A. $7\dfrac{2}{5}$
B. $\dfrac{1}{2}$
C. $\dfrac{3}{2}$
D. $1$
E. $\dfrac{2}{1}$
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