ANSWER
mFJH = 210º
Step-by-step explanation
The measure of an arc is twice the measure of the inscribed angle subteded by it:

First we have to find x:

Apply distributive property of addition on the right side:

Now we have to get the x together on the same side of the equation. To do that we have to subtract 12x from both sides:

Now, add 28 to both sides:

And finally divide both sides by 5:

Now, with x = 14, we just have to replace it into the expression for the measure of arc FJH:

The measure of arc FJH is 210º