a) \(x= \dfrac{1}{2}+\dfrac{3}{4}\)
\(x= \dfrac{2+3}{4}\)
\(x=\dfrac{5}{4}\)
b) \(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)
\(\dfrac{-5}{6}-x=\dfrac{7-4}{12}\)
\(\dfrac{-5}{6}-x=\dfrac{3}{12}\).
\(x=\dfrac{-5}{6}-\dfrac{3}{12}\)
\(x=\dfrac{(-10)+(-3)}{12}\)
\(x=\dfrac{-13}{12}.\)