=>-10/3-x=7/12-4/12=3/12=1/4
=>x=-10/3-1/4=-40/12-3/12=-43/12
\(4.-\dfrac{5}{6}-x=\dfrac{7}{12}+-\dfrac{1}{3}\)
\(\Leftrightarrow-\dfrac{10}{3}-x=\dfrac{1}{4}\)
\(\Leftrightarrow-x=\dfrac{1}{4}+\dfrac{10}{3}\)
\(\Leftrightarrow-x=\dfrac{43}{12}\)
\(\Leftrightarrow x=-\dfrac{43}{12}\)