Calculate each of the following. State your answers as reduced fractions.
a. 67+57\displaystyle \frac{{6}}{{7}}+\frac{{5}}{{7}} =  
b. 3536+34\displaystyle \frac{{35}}{{36}}+\frac{{3}}{{4}} =  
c. 12+35\displaystyle \frac{{1}}{{2}}+\frac{{3}}{{5}} =  

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