$$ \begin{aligned} 2\cdot(-3)-12+8 &= 0&& \text{simplify left side} \\[1 em]-6-12+8 &= 0&& \\[1 em]-10 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ -10 = 0 } $ is FALSE, we conclude that the equation has no solution.
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