4x4 = 108x
4x4 - 108x = 0
4x(x3 -27) = 0
Now x3 - 27 = x3 - 33 is a difference of cubes which has a standard factor formula: a3-b3 = (a+b)(a2-ab+b2). Hence we get:
(4x)(x3-33) = (4x)(x+3)(x2-3x+9)
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