## Encyclopedia > List of rare diseases starting with U

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 Gauss elimination method ... & 0 & -1 & 1 \end{pmatrix} [/itex] or, after dividing the rows by 2, .5 and -1, respectively: [itex] \begin{pmatrix} 1 & 0 & 0 & 2 \\ 0 & 1 & 0 & 3 ...