$$ \begin{aligned} -8x+4 &= -6x+24&& \text{move the $ \color{blue}{ -6x } $ to the left side and $ \color{blue}{ 4 }$ to the right} \\[1 em]-8x+6x &= 24-4&& \text{simplify left and right hand side} \\[1 em]-2x &= 20&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= -\frac{20}{2}&& \\[1 em]x &= -10&& \\[1 em] \end{aligned} $$
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