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\frac{2}{7}-3
Add 4 and 3 to get 7.
\frac{2}{7}-\frac{21}{7}
Convert 3 to fraction \frac{21}{7}.
\frac{2-21}{7}
Since \frac{2}{7} and \frac{21}{7} have the same denominator, subtract them by subtracting their numerators.
-\frac{19}{7}
Subtract 21 from 2 to get -19.