Factorise
15xy - 15x²y²
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15xy - 6x + 5y - 2
15xy - 6x + 5y - 215xy + 5y - 6x -2
15xy - 6x + 5y - 215xy + 5y - 6x -25y(3x+1) - 2 (3x+1)
15xy - 6x + 5y - 215xy + 5y - 6x -25y(3x+1) - 2 (3x+1)(5y -2) (3x + 1)
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