\(a,\)\(x+\dfrac{1}{4}=\dfrac{4}{3}\)
\(x=\dfrac{4}{3}-\dfrac{1}{4}\)
\(x=\dfrac{16-3}{12}=\dfrac{13}{12}\)
__________
\(b,\dfrac{1}{4}:x=\dfrac{2}{5}\)
\(x=\dfrac{1}{4}:\dfrac{2}{5}\)
\(x=\dfrac{5}{8}\)
__________
\(c,\dfrac{4}{3}-x=\dfrac{1}{5}\)
\(x=\dfrac{4}{3}-\dfrac{1}{5}\)
\(x=\dfrac{20-3}{15}=\dfrac{17}{15}\)