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Question
$$23-3\cdot4+2 = 9$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 23-3\cdot4+2 &= 9&& \text{simplify left side} \\[1 em]23-12+2 &= 9&& \\[1 em]13 &= 9&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 13 = 9 } $ is FALSE, we conclude that the equation has no solution.
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