To simplify this expression, we first perform polynomial long division:
3x^2 + 8x - 3 + (-18)/(x + 3)
Therefore, the simplified expression is:
3x^2 + 8x - 3 + (-18)/(x + 3)
`\frac{\left(3x^{3}+17x^{2}+21x-9\right)}{\left(x+3\right)}`
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