Calculate each of the following. State your answers as reduced fractions.
a. 78−18\displaystyle \frac{{7}}{{8}}-\frac{{1}}{{8}} =  
b. 43−17\displaystyle \frac{{4}}{{3}}-\frac{{1}}{{7}} =  
c. 7−18\displaystyle {7}-\frac{{1}}{{8}} =  

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