Find all real numbers $x$ such that $\left(\dfrac{x}{3}\right)^3-3x^2+81x-729=25+2(5)(3)+9.$
Question:
Find all real numbers $x$ such that $\left(\dfrac{x}{3}\right)^3-3x^2+81x-729=25+2(5)(3)+9.$
Answer:
Let's think step by step.

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Find all real numbers $x$ such that $\left(\dfrac{x}{3}\right)^3-3x^2+81x-729=25+2(5)(3)+9.$
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