$$66x = 66x$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} 66x &= 66x&& \text{move the $ \color{blue}{ 66x } $ to the left side} \\[1 em]66x-66x &= 0&& \text{simplify left side} \\[1 em]66x-66x &= 0&& \\[1 em]0 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{blue}{ 0 = 0 } $ is TRUE for any value of $ x $, we conclude that the equation has infinitely many solutions.
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