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\frac{-\left(\frac{2}{5}-\left(\frac{3}{8}+\frac{13}{7}\right)\right)}{\frac{2}{5}-\left(\frac{3}{8}+\frac{13}{7}\right)}
Extract the negative sign in \frac{13}{7}+\frac{3}{8}-\frac{2}{5}.
-1
Cancel out \frac{2}{5}-\left(\frac{3}{8}+\frac{13}{7}\right) in both numerator and denominator.
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