We know that in a parallelogram the opposite sides are equal, then from the figure:
[tex]3x+5=6x-10[/tex]Solving for x we have:
[tex]\begin{gathered} 3x+5=6x-10 \\ 3x-6x=-5-10 \\ -3x=-15 \\ x=\frac{-15}{-3} \\ x=5 \end{gathered}[/tex]Therefore x=5 and the answer is the third option.
