fix - #75
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`Symbolics.symbolic_linear_solve` returns nested fractions whose denominators carry the coefficient determinant. For a trigonometric ansatz those denominators hold identities like cos(x)^2 + sin(x)^2 = 1 that SymbolicUtils 4 no longer collapses, so `rearrange!` grew expressions without bound on larger systems (a van der Pol oscillator with two harmonics exhausted 16 GB and never finished). Solve the system with fraction-free Bareiss elimination instead, falling back to `symbolic_linear_solve` when the system is not polynomial in the unknowns.
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