<prompt> Hebufx fracaxx 1.Tafuta a isiyobadilika ili ffx x kwa x zote neq -1.  <response>: Tuna hiyoanzaalignffx f left fracaxx 1 kulia fraca cdot fracaxx 1fracaxx 1 1 fraca2 xax x 1.mwishoalignTunatakafraca2 xax x 1 xkwa x neq -1. Hii inatupaa2 x shoka2 x2 x.Ikilinganisha na migawo, tunapata a2 1 na a 1 0. Hivyo, a -1. 