$$ \begin{aligned} 4x+29 &= 5-8(x+6)&& \text{simplify right side} \\[1 em]4x+29 &= 5-(8x+48)&& \\[1 em]4x+29 &= 5-8x-48&& \\[1 em]4x+29 &= -8x-43&& \text{move the $ \color{blue}{ -8x } $ to the left side and $ \color{blue}{ 29 }$ to the right} \\[1 em]4x+8x &= -43-29&& \text{simplify left and right hand side} \\[1 em]12x &= -72&& \text{ divide both sides by $ 12 $ } \\[1 em]x &= -\frac{72}{12}&& \\[1 em]x &= -6&& \\[1 em] \end{aligned} $$

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