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put x and y =1
x²+xy-3y²-y+2=0
(1)²+(1)(1)-3(1)²-(1)+2=0
1+1-3-1+2=0
4-4=0
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x²+xy-3y²-y+2=0
(1)²+(1)(1)-3(1)²-(1)+2=0
1+1-3-1+2=0
4-4=0
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