<prompt> Kwa mathbfv anzapmatrix -10 6 endpmatrix na mathbfw anzapmatrix 15 -9 endpmatrix, hesabu textproj_mathbfw mathbfv.  <response>: Tanguboldv anzapmatrix -10 6 mwishopmatrix -frac23 anzapmatrix 15 -9 endpmatrix - frac23 boldwni kizidishio cha boldw,maandishiproj_boldw boldv boldv anzapmatrix -10 6 mwishopmatrix. 