factorise 512 a + 343 b
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=(8cuberoot of a)^3+(7cuberoot of b)^3
=(8cuberoot of a+7cuberoot of b)(64cuberoot of a x cuberoot of a-56cuberoot of ab+49cuberoot of b)
=(8cuberoot of a+7cuberoot of b)(64cuberoot of a x cuberoot of a-56cuberoot of ab+49cuberoot of b)
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