<prompt> Tafuta kinyume cha matrixanzapmatrix 2 3 -1 7 mwishopmatrix.Ikiwa kinyume hakipo, basi ingiza sifuri matrix.  <response>: Kutoka kwa formula,anzapmatrix 2 3 -1 7 mwishopmatrix-1 frac127 - 3-1 anza pmatrix 7 -3 1 2 mwishopmatrix anzapmatrix 717 -317 117 217 mwishopmatrix. 