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If B = [{:(5, 2alpha, 1),(0, 2, 1),...

If `B = [{:(5, 2alpha, 1),(0, 2, 1),(alpha, 3, -1):}]` is the inverse of a `3 xx 3` matrix A, then the sum of all values of `alpha`
for which det (A) + 1 =0, is

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