Wonderful Wedge

Geometry Level pending

There is a triangular prism based on a right triangle. The length of the triangle's leg is 21 units. The hypotenuse is 4x+6 and the depth is x. If you create a rectangle using the hypotenuse and the prism's depth, the area is 1293.75 units.

(Look at image below)

What is the volume of the triangular prism?

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