a: \(\Leftrightarrow x-\dfrac{1}{5}=\dfrac{7}{11}\cdot\dfrac{1}{7}=\dfrac{1}{11}\)
hay \(x=\dfrac{1}{11}+\dfrac{1}{5}=\dfrac{5+11}{55}=\dfrac{16}{55}\)
b: \(\Leftrightarrow\dfrac{x}{25}=\dfrac{-21}{90}=\dfrac{-7}{30}\)
hay \(x=-\dfrac{175}{30}=-\dfrac{35}{6}\)
c: \(\Leftrightarrow x+\dfrac{7}{5}=\dfrac{4}{8}\cdot\dfrac{9}{27}=\dfrac{1}{6}\)
hay \(x=\dfrac{1}{6}-\dfrac{7}{5}=\dfrac{5-42}{30}=\dfrac{-37}{30}\)
d: \(\Leftrightarrow x:\dfrac{5}{11}=\dfrac{-24}{12}=-2\)
hay x=-10/11
a, <=> \(x-\dfrac{1}{15}=\dfrac{1}{11}\Leftrightarrow x=\dfrac{26}{165}\)
b, \(\Leftrightarrow\dfrac{x}{25}=\dfrac{-7}{30}\Rightarrow x=-\dfrac{35}{6}\)
c, \(\Leftrightarrow x+\dfrac{7}{5}=\dfrac{1}{6}\Leftrightarrow x=-\dfrac{37}{30}\)
d, \(\Leftrightarrow x:\dfrac{5}{11}=-2\Leftrightarrow x=-\dfrac{10}{11}\)
