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?$=\frac {6}{7}+\frac {1}{7}+\frac {3}{4}$?
?$=1+\frac {3}{4}$?
?$= 1\frac {3}{4}$?
?$=\frac {7}{8}-\frac {1}{10}$?
?$=\frac {35}{40}-\frac {4}{40}$?
?$= \frac {31}{40}$?
?$=(\frac {1}{8}+\frac {1}{8})+(\frac {4}{7}+\frac {3}{7})$?
?$=\frac {1}{4}+1$?
= $1\frac{1}{4}$
?$=1-\frac {19}{30}$?
?$= \frac {11}{30}$?
?$=\frac {13}{10}-(\frac {2}{9}+\frac {7}{9})$?
?$=\frac {13}{10}-1$?
?$= \frac {3}{10}$?
?$=\frac {50}{60}+\frac {45}{60}-\frac {24}{60}$?
?$=\frac {95}{60}-\frac {24}{60}$?
?$= \frac {71}{60}$?
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