Opposite angles are equivalent. Therefore,

First, we set the angles equal to each other. Then, we simplify the sides. Then, we subtract 3x from both sides and subtract 2 from both sides. The we divide both sides by 2. Now we know that x = 20, but we're not done yet.
Now we have to find the measure of the angle KNL. We do this by plugging in x:

First, we simplify. Then, we plug in 20 for x. Then we simplify to find the angle is 102°.
We can check this by looking at the opposite angle:

These angles are the same, as they should be.