If $\vec{a},\vec{b},\vec{c}and\vec{d}$ are four vectors in three-dimensional space with the same initial point and such that $3\vec{a}-2\vec{b}+\vec{c}-2\vec{d}=0$ , show that terminals $A,B,CandD$ of these vectors are coplanar. Find the point at which $ACandBD$ meet. Find the ratio in which $P$ divides $ACandBD\dot{}$

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