$$ \begin{aligned} 4x &= 6(x+8)&& \text{simplify right side} \\[1 em]4x &= 6x+48&& \text{move the $ \color{blue}{ 6x } $ to the left side} \\[1 em]4x-6x &= 48&& \text{simplify left side} \\[1 em]-2x &= 48&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= -\frac{48}{2}&& \\[1 em]x &= -24&& \\[1 em] \end{aligned} $$
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