$$ \begin{aligned} -10+2-1+2+3 &= 0&& \text{simplify left side} \\[1 em]-9+5 &= 0&& \\[1 em]-4 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ -4 = 0 } $ is FALSE, we conclude that the equation has no solution.
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