-2,5y+y=-2,5*y+1*y=(-2,5+1)*у=-1,5у
-2,5у-у=(-2,5-1)у=-3,5у
2,5у+у=(2,5+1)у=3,5у
2,5у-у=(2,5-1)у=1,5у
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-2,5y+y=-2,5*y+1*y=(-2,5+1)*у=-1,5у
-2,5у-у=(-2,5-1)у=-3,5у
2,5у+у=(2,5+1)у=3,5у
2,5у-у=(2,5-1)у=1,5у