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[tex] \frac{ \frac{10}{15}+ \frac{3}{15} }{ \frac{4}{10}- \frac{5}{10} } = \frac{ \frac{13}{15} }{- \frac{1}{10} } = \frac{13}{15} *(-10)= - 26/3 = - 8 i 2/3