You can put this solution on YOUR website! Solve how, for what? That is an expression, and is not equal to anything. You could try to factor it, but not much else; OR you could take the expression as a function and determine some characteristics about it like asymptotes, intercepts, and limits.
WRITE IT LIKE THIS:
(3x^3 +6x+x^3)/(5-6x)
and the cube terms in numerator should be combined:
and if wanted,
With that, what more do you want done or found?
Three roots and one vertical asymptote.
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