{-\dfrac{2}{3}a+\dfrac{5}6a-\dfrac{1}6}

Answer 1

=\left(-\dfrac{2}{3} + \dfrac{5}{6}\right)a - \dfrac{1}{6}
=\dfrac{-4 + 5}{6}a - \dfrac{1}{6}
=\dfrac{1}{6}a - \dfrac{1}{6}
=\boxed{\dfrac{1}{6}a - \dfrac{1}{6}}