X^2-9Y^2+3Y-X
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X^2-9Y^2+3Y-XX^2-9Y^2+3Y-XX^2-9Y^2+3Y-Xx²-9y²+3y-x=(x+3y)(x-3y)-(x-3y)=(x-3y)(x+3y-1)
X^2-9Y^2+3Y-X
X^2-9Y^2+3Y-X
X^2-9Y^2+3Y-X
x²-9y²+3y-x=(x+3y)(x-3y)-(x-3y)=(x-3y)(x+3y-1)
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