a) \(x + \dfrac{1}{3} = \dfrac{3}{4}\)
\(x = \dfrac{3}{4} - \dfrac{1}{3} \)
\(x= \dfrac{9}{12} - \dfrac{4}{12} \)
\(x= \dfrac{5}{12}\)
b) \(x - \dfrac{2}{5} = \dfrac{5}{7}\)
\(x = \dfrac{5}{7} + \dfrac{2}{5} \)
\(x= \dfrac{25}{35} + \dfrac{14}{35}\)
\(x= \dfrac{39}{35} = 1\dfrac{4}{35}\)
c) \(-x - \dfrac{2}{3} = - \dfrac{6}{7}\)
\(\dfrac{-2}{3} + \dfrac{6}{7} = x \)
\(x = -\dfrac{14}{21} + \dfrac{18}{21} \)
\(x= \dfrac{4}{21}\)
d) \(\dfrac{4}{7} - x = \dfrac{1}{3}\)
\(\dfrac{4}{7} - \dfrac{1}{3} = x\)
\( x = \dfrac{12}{21} - \dfrac{7}{21}\)
\(x= \dfrac{5}{21}\)
