You need to divide the terms `3sqrt2` and `3a` such that:

`3sqrt2/(3a) `

Notice that numerator `3sqrt2` and denominator `3a` have in common the factor `3` , hence, you may divide both by `3` such that:

`3sqrt2/(3a) = sqrt2/a`

Since the problem does not provides information about the number a, you may stop the division at this moment.

If a is is a radical number, you need to multiply by `sqrt a` to remove the radical from denominator.

If a represents an expression of form `root(n) x+ root(n) y,` you need to perform the multiplication by the conjugate of `root(n) x + root(n) y` to remove the radicals from denominator.

**Hence, since there are no information about a and performing the division, yields `3sqrt2/(3a) = sqrt2/a.` **

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