2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]

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2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]2(x²-xy)-3(2x²-3xy)-2[X²

2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]
2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]

2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]
=2x²-2xy-6x²+9xy-2x²+4x²-2xy+2y²
=-2x²+5xy+2y²