RREFa(M, V) = RREF solution U to augmented matrix [M,V], M*U=V:
Uses RREF of matrix M augmented with V to compute U such that M * U = V. V must have the sane number of rows as M and can have 1 or more columns. If V has one column and M is a non-singular square matrix, this produces the same result as Solve(M, V).
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