Solving for x in 3x-(6x+1/2) =5, we get
[tex]\begin{gathered} 3x-(6x+\frac{1}{2})=5 \\ 3x-(\frac{6x\times2+1}{2})=5 \\ 3x-(\frac{12x+1}{2})=5 \\ \frac{3x\times2-12x-1}{2}=5 \\ 6x-12x-1=5\times2 \\ -6x-1=10 \\ -6x=10+1 \\ -6x=11 \\ x=\frac{-11}{6} \end{gathered}[/tex]Therefore, the value of x is -11/6.