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Solve a 2×2 linear system.

For a system A x = b with A = [[a,b],[c,d]] and b = [r,s], returns x using Cramer's rule. If the determinant is near zero, returns a zero vector as a soft failure.

>>> solve2 [[1.0, 2.0], [3.0, 4.0]] [5.0, 6.0]
[-4.0,4.5]