Solve (2a-3b) whole cube
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using identity : (a-b)3 = a3 - b3 - 3ab(a-b)
(2a - 3b)3
= (2a)3 - (3b)3 - 3*2a*3b (2a - 3b)
= 8a3 - 27b3 - 18ab * 2a + 18ab * 2b
= 8a3 - 27b3 - 36 a2b + 36 ab2
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