What is the value of $\dfrac{5}{7}$ $-$ $\dfrac{4}{6}$?
A. $\dfrac{1}{21}$
B. $\dfrac{9}{13}$
C. $\dfrac{14}{13}$
D. $1$
E. $\dfrac{50}{21}$
A. $\dfrac{1}{21}$
B. $\dfrac{9}{13}$
C. $\dfrac{14}{13}$
D. $1$
E. $\dfrac{50}{21}$
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