(2x+3y)(3x+4y)-(7x+3y)(x+2y).
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2x(3x+4y)+3y(3x+4y)-7x(x+2y)+3y(x+2y)
6x²+8xy+9xy+5y²-7x² -14xy+3xy+6y²
-x2+5xy+11y²+3xy
x²-8xy-11y²
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