Evidently you must not have taught the right math courses at your school.
Back in the day, we has a whole year of number-free mathematics in high school called “plane geometry” in which we did proofs from Euclid’s postulates and compass-and-straight-edge constructions. It was actually much more like what mathematicians actually do than the dry rote derivation of simultaneous solutions to systems of linear equations, finding roots of polynomials, or implementing the recursive algorithm that finds formulas of derivatives for functions expressed in terms of arithmetic operations and composition of elementary functions.
The fact that according to you mathematicians don’t do mathematics, suggests your notion of what mathematics is needs a bit of brushing up.
I majored in math at the graduate level and I think I am qualified to make such a statement.
You need to apologize to RF for being a jerk.
Let's see if you as good at gentlemanly behavior as you are at math.
BTW, I got the answer to this problem in about an hour of noodling. Look upthread.