Question
$$18+72 = 90$$
Answer
The equation has an infinite number of solutions.
Explanation
$$ \begin{aligned} 18+72 &= 90&& \text{simplify left side} \\[1 em]90 &= 90&& \\[1 em] \end{aligned} $$
Since the statement $ \color{blue}{ 90 = 90 } $ is TRUE for any value of $ x $, we conclude that the equation has infinitely many solutions.
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