Question
$$12+5 = 4-2$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 12+5 &= 4-2&& \text{simplify left and right hand side} \\[1 em]17 &= 2&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ 17 = 2 } $ is FALSE, we conclude that the equation has no solution.
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