$$ \begin{aligned} 2(3a+5) &= 2a+54&& \text{simplify left side} \\[1 em]6a+10 &= 2a+54&& \text{move the $ \color{blue}{ 2a } $ to the left side and $ \color{blue}{ 10 }$ to the right} \\[1 em]6a-2a &= 54-10&& \text{simplify left and right hand side} \\[1 em]4a &= 44&& \text{ divide both sides by $ 4 $ } \\[1 em]a &= \frac{44}{4}&& \\[1 em]a &= 11&& \\[1 em] \end{aligned} $$

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