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Solving 2 linear equations using Cramer's rule.
3x - 7y = 5
5x + 3y = 11
3 * 3 - ( - 7) * 5  =   44.0 [DetA]
5 * 3 - ( - 7) * 11  =   92.0 [DetAx]
3 * 11 - 5 * 5  =   8.0 [DetAy]
x:
[DetAx] / [DetA]  =   2.09090909091 … [x]
y:
[DetAy] / [DetA]  =   0.181818181818 … [y]
verification:
3 * [x] - 7 * [y]  =   5.0 [6]
5 * [x] + 3 * [y]  =   11.0 [7]
ok
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