Question
$$3x\cdot3x\cdot3x+3 = 3+5$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 3x\cdot3x\cdot3x+3 &= 3+5&& \text{simplify left and right hand side} \\[1 em]27x^3+3 &= 8&& \text{move all terms to the left hand side } \\[1 em]27x^3+3-8 &= 0&& \text{simplify left side} \\[1 em]27x^3-5 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
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Equations Solver