I ask because I have what I think is a solution, but it doesn't fit the spirit of the joke, which is to say, it doesn't produce anything like a pin.
The solution I get is the equation below:
$$-\frac{135\sqrt2\ln(3-2\sqrt2)+404}{16\sqrt2}$$
However, this solves to a transcendental number, beginning:
$$-2.98126694400553644032103778411344302709190188721887186739\cdots$$
So, I'm appealing for better or more informed solutions if I have made a mistake.
Does the equation solve to something nice and friendly, or is the whole thing just a wheeze?