Question
$$-15 = -4+5$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} -15 &= -4+5&& \text{simplify right side} \\[1 em]-15 &= 1&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ -15 = 1 } $ is FALSE, we conclude that the equation has no solution.
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