<prompt> Acha x na y ziwe nambari changamano kama hizofracx yx - y fracx - yx y 1.Tafutafracx4 y4x4 - y4 fracx4 - y4x4 y4.  <response>: Kuweka fracx yx - y fracx - yx y juu ya denominator ya kawaida, tunapata frac2x2 2y2x2 - y2 1.Kisha 2x2 2y2 x2 - y2, hivyo x 2 -3y2.Kishaanzaalignfracx4 y4x4 - y4 fracx4 - y4x4 y4 frac9y4 y49y4 - y4 frac9y4 - y49y4 y4 frac108 frac810 frac54 frac45 frac4120.mwishopanga 