(x-5/8).5/8=-15/39
<=>x-5/8=-15/39 : 5/8
<=>x-5/8=-8/13
<=>x=-8/13 + 5/8
<=>x=1/104
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\(\left(x-\dfrac{5}{8}\right).\dfrac{5}{8}=\dfrac{-15}{39}\)
\(x-\dfrac{5}{8}=\dfrac{-15}{39}:\dfrac{5}{8}\)
\(x-\dfrac{5}{8}=\dfrac{-8}{13}\)
\(x=\dfrac{-8}{13}+\dfrac{5}{8}\)
\(x=\dfrac{1}{104}\)
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Ta có: \(\left(x-\dfrac{5}{8}\right)\cdot\dfrac{5}{8}=\dfrac{-15}{39}\)
\(\Leftrightarrow x-\dfrac{5}{8}=\dfrac{-5}{13}:\dfrac{5}{8}=\dfrac{-5}{13}\cdot\dfrac{8}{5}=\dfrac{-8}{13}\)
hay \(x=\dfrac{1}{104}\)
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