Civil PE Exam - Transportation - Find the Length of a Vertical Curve Passing Underneath a Bridge

This is a nice vertical curve problem for the PE Civil Transportation Exam! 🚗🚦 A vertical curve is being designed to pass underneath a bridge, and you have to calculate the curve length to keep the 25-feet clearance distance.
Try to solve this one on your own first, then jump back in and let's solve it together. 😉
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Aren't the grades supposed to be written in % form in the equation, not decimal? And is the distance x in the equation in feet or in stations?