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\MATRIXVECTORPRODUCT(1,-1;
                     0, 2)(3,5)(\sola,\solb)
$\begin{bmatrix}
     1 & -1 \\ 0 & 2
 \end{bmatrix}
 \begin{bmatrix}
      3 \\ 5
 \end{bmatrix}
  =\begin{bmatrix}
         \sola \\ \solb
   \end{bmatrix}$