Cho biết: \(-\dfrac{4}{5}.x+\dfrac{1}{3}=\dfrac{6}{5}\). Khẳng định nào sau đây là đúng?
\(x=-\dfrac{13}{12}\). \(x=\dfrac{13}{12}\). \(x=\dfrac{3}{4}\). \(x=-\dfrac{3}{4}\). Hướng dẫn giải:\(-\dfrac{4}{5}.x+\dfrac{1}{3}=\dfrac{6}{5}\)
\(\Leftrightarrow-\dfrac{4}{5}x=\dfrac{6}{5}-\dfrac{1}{3}\)
\(\Leftrightarrow-\dfrac{4}{5}x=\dfrac{13}{15}\)
\(\Leftrightarrow x=\dfrac{13}{15}:\dfrac{-4}{5}\)
\(\Leftrightarrow x=-\dfrac{13}{12}\).
