$$ \begin{aligned} 3(x+8) &= x+6&& \text{simplify left side} \\[1 em]3x+24 &= x+6&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 24 }$ to the right} \\[1 em]3x-x &= 6-24&& \text{simplify left and right hand side} \\[1 em]2x &= -18&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= -\frac{18}{2}&& \\[1 em]x &= -9&& \\[1 em] \end{aligned} $$

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