$$ \begin{aligned} 8(x+9) &= 5(x+3)&& \text{simplify left and right hand side} \\[1 em]8x+72 &= 5x+15&& \text{move the $ \color{blue}{ 5x } $ to the left side and $ \color{blue}{ 72 }$ to the right} \\[1 em]8x-5x &= 15-72&& \text{simplify left and right hand side} \\[1 em]3x &= -57&& \text{ divide both sides by $ 3 $ } \\[1 em]x &= -\frac{57}{3}&& \\[1 em]x &= -19&& \\[1 em] \end{aligned} $$

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