(x+y) (2x+3y)-(x+y) (x+1)
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X square + Y square + 4 x y - X - 1
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(x+y)(2x+3y)-(x+y)(x+1)
2x^2+3xy+2xy+3y^2 -(x^2+x+xy+y)
=>2x^2+ 5xy+ 3y^2- x^2- x- xy- y
x^2+ 3y^2+ 3y^2- x- y
2x^2+3xy+2xy+3y^2 -(x^2+x+xy+y)
=>2x^2+ 5xy+ 3y^2- x^2- x- xy- y
x^2+ 3y^2+ 3y^2- x- y
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