Question
$$11a+9 = 4a+30$$
Answer
$$ a = 3 $$
Explanation
$$ \begin{aligned} 11a+9 &= 4a+30&& \text{move the $ \color{blue}{ 4a } $ to the left side and $ \color{blue}{ 9 }$ to the right} \\[1 em]11a-4a &= 30-9&& \text{simplify left and right hand side} \\[1 em]7a &= 21&& \text{ divide both sides by $ 7 $ } \\[1 em]a &= \frac{21}{7}&& \\[1 em]a &= 3&& \\[1 em] \end{aligned} $$
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