$$ \begin{aligned} -(5a+6) &= 2(3a+8)&& \text{simplify left and right hand side} \\[1 em]-5a-6 &= 6a+16&& \text{move the $ \color{blue}{ 6a } $ to the left side and $ \color{blue}{ -6 }$ to the right} \\[1 em]-5a-6a &= 16+6&& \text{simplify left and right hand side} \\[1 em]-11a &= 22&& \text{ divide both sides by $ -11 $ } \\[1 em]a &= -\frac{22}{11}&& \\[1 em]a &= -2&& \\[1 em] \end{aligned} $$

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