Find all real numbers $x$ such that $\left(\dfrac{x}{3}\right)^3-3x^2+81x-729=25+2(5)(3)+9.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Find all real numbers $x$ such that $\left(\dfrac{x}{3}\right)^3-3x^2+81x-729=25+2(5)(3)+9.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
39
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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