.x+y=1/2 б). 2x-y=7 в). -3x+5y=1
у=1/2-х, у=2х-7 у=(1+3х)/5
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.x+y=1/2 б). 2x-y=7 в). -3x+5y=1
у=1/2-х, у=2х-7 у=(1+3х)/5