factorise 15 X + y whole square - 5 x minus 5 y
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15x + y² - 5x-5y
=15x-5x+y²-5y
=10x+y²-5y
=10x+y(y-5)
=15x-5x+y²-5y
=10x+y²-5y
=10x+y(y-5)
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