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-\frac{9}{7}+\frac{5}{4}
Fraction \frac{9}{-7} can be rewritten as -\frac{9}{7} by extracting the negative sign.
-\frac{36}{28}+\frac{35}{28}
Least common multiple of 7 and 4 is 28. Convert -\frac{9}{7} and \frac{5}{4} to fractions with denominator 28.
\frac{-36+35}{28}
Since -\frac{36}{28} and \frac{35}{28} have the same denominator, add them by adding their numerators.
-\frac{1}{28}
Add -36 and 35 to get -1.