<PRE><B>Question 939629</B>
For a parallelogram, the two opposite angle are always equal,
Therefore, what we have to do is take two of the  opposite angles given and equate to find x,
we can use P and R or S and Q
If I decide to use P and R, {{{3*x-12 =x+6}}}
Solving the equation, 2*x =18
x = 18/2 = 9

Also using S and Q,
{{{4*x-15=2*x+3}}}
2*x =18
and x =2

QED</PRE>