Factorise: 125x 3 + y 3 /27
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a^3 + b^3 = (a + b)*(a^2 - ab + b^2)
125a^3 + y^3/27 = (5a + y/3) * (25a^2 - 5ay/3 + y^2/9)
125a^3 + y^3/27 = (5a + y/3) * (25a^2 - 5ay/3 + y^2/9)
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