Find the equation of plane which contains the line $\displaystyle l:\left\{\begin{array}{l} x=t+2 \\y=2t-1\\z=3t+3 \end{array}\right.$, and makes the angle of $\displaystyle 2\pi/3$ with the plane $\displaystyle \pi:x+3y-z+8=0$.

Actually don't have any idea so I need your help.