3(x²-2xy)-2(-3xy+y²)
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3(x²-2xy)-2(-3xy+y²)
3(x²-2xy)-2(-3xy+y²)
3(x²-2xy)-2(-3xy+y²)
3(x²-2xy)-2(-3xy+y²)
=3x²-6xy+6xy-2y²
=3x²-2y²
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