express in simplest form, using positive rational exponents: 3x^-1/3(x^1/3-4x^4/3)

express in simplest form, using positive rational exponents: 3x^-1/3(x^1/3-4x^4/3)
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3x^(-1/3) * (x^(1/3) - 4x^(4/3))
= 3(x^(1/3) - 4x^(4/3)) / x^(1/3)
= 3(x^((1/3) - (1/3)) - 4x^((4/3) - (1/3)))
= 3(x^0 - 4x^(3/3))
= 3(1 - 4x^1)
= 3(1 - 4x)
= 3 - 12x

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