a,\(x=-\dfrac{5}{6}+\dfrac{7}{12}\)
\(x=-\dfrac{1}{4}\)
b,\(\dfrac{3}{8}:x=\dfrac{3}{8}-\left(-\dfrac{11}{12}\right)\)
\(\dfrac{3}{8}:x=\dfrac{31}{24}\)
\(x=\dfrac{3}{8}:\dfrac{31}{24}\)
\(x=\dfrac{9}{31}\)
c,\(\dfrac{2}{3}.\left(x+\dfrac{5}{6}\right)=-\dfrac{5}{9}-\dfrac{1}{3}\)
\(\dfrac{2}{3}.\left(x+\dfrac{5}{6}\right)=-\dfrac{8}{9}\)
\(x+\dfrac{5}{6}=-\dfrac{8}{9}:\dfrac{2}{3}\)
\(x+\dfrac{5}{6}=-\dfrac{4}{3}\)
\(x=-\dfrac{4}{3}-\dfrac{5}{6}\)
\(x=\dfrac{1}{2}\)