Calculate each of the following:
a. 728\displaystyle \frac{{72}}{{8}} =
b. −205\displaystyle \frac{{-{20}}}{{5}} =
c. 54−6\displaystyle \frac{{54}}{{-{6}}} =
d. −21−7\displaystyle \frac{{-{21}}}{{-{7}}} =

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