\(\dfrac{-15}{5,1}=\dfrac{-35}{11,9}\\ \Rightarrow\dfrac{-15}{-35}=\dfrac{5,1}{11,9};\dfrac{11,9}{5,1}=\dfrac{-35}{-15};\dfrac{5,1}{-15}=\dfrac{-35}{11,9}\)
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