$$ \begin{aligned} -1+3(x+2) &= 5\cdot(1+8x)&& \text{simplify left and right hand side} \\[1 em]-1+3x+6 &= 5+40x&& \\[1 em]3x+5 &= 40x+5&& \text{move the $ \color{blue}{ 40x } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]3x-40x &= 5-5&& \text{simplify left and right hand side} \\[1 em]-37x &= 0&& \text{ divide both sides by $ -37 $ } \\[1 em]x &= \frac{0}{-37}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$

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