25x^2+10xy+y^2=4x^2+12xy+9y^2
25x^2+10xy+y^2-4x^2-12xy-9y^2=0
21x^2-2xy-8y^2=0
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25x^2+10xy+y^2=4x^2+12xy+9y^2
25x^2+10xy+y^2-4x^2-12xy-9y^2=0
21x^2-2xy-8y^2=0