IF P is a right angle, you can use Pythagoras' Theorem to determine the hypotenuse
of the large triangle. Then just subtract 2 from that, and you've got the value of X.
IF P is a right angle, then (X+2) = sqrt(202+122)
X+2 = sqrt(544) = 23.3
X = 21.3
All this, IF you can find something that says P is a right angle. If not, then disregard the above.
The bisected angle PRQ sets up the following relationship
x + 2 /12 = 12 / 8
x + 2 / 12 = 3 / 2 multily both sides by 12
x + 2 = 12 ( 3/2)
x + 2 = 18
x = 16