$$ \begin{aligned} 8-8(x+9)-3x &= 5+8&& \text{simplify left and right hand side} \\[1 em]8-(8x+72)-3x &= 13&& \\[1 em]8-8x-72-3x &= 13&& \\[1 em]-11x-64 &= 13&& \text{ move -64 to the right } \\[1 em]-11x &= 13+64&& \\[1 em]-11x &= 77&& \text{ divide both sides by $ -11 $ } \\[1 em]x &= -\frac{77}{11}&& \\[1 em]x &= -7&& \\[1 em] \end{aligned} $$

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