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If (5x + 1)^3 + (x - 3)^3 + 8(3x - 4)^3 ...

If `(5x + 1)^3 + (x - 3)^3 + 8(3x - 4)^3 =6 (5x + 1)(x- 3)(3x- 4)`, then x is equal to:

A

`5/6`

B

`3/4`

C

`1/3`

D

`2/3`

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