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7/8-8/10 substracting with unlike denominators
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7/8-8/10 substracting with unlike denominators

User Claustrofob
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\begin{gathered} (7)/(8)-(8)/(10)=(7*10-8*8)/(8*10) \\ \\ =(70-64)/(80) \\ =(6)/(80) \\ \\ =(3)/(40) \end{gathered}

User Godidier
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