\(\Leftrightarrow x-4=\dfrac{-2}{5}\cdot\dfrac{5}{7}=\dfrac{-2}{7}\)
=>x=-2/7+4=26/7
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\(\Leftrightarrow x-4=\dfrac{-2}{5}\cdot\dfrac{5}{7}=\dfrac{-2}{7}\)
=>x=-2/7+4=26/7