Question
$$6x+9 = 3x+12$$
Answer
$$ x = 1 $$
Explanation
$$ \begin{aligned} 6x+9 &= 3x+12&& \text{move the $ \color{blue}{ 3x } $ to the left side and $ \color{blue}{ 9 }$ to the right} \\[1 em]6x-3x &= 12-9&& \text{simplify left and right hand side} \\[1 em]3x &= 3&& \text{ divide both sides by $ 3 $ } \\[1 em]x &= \frac{3}{3}&& \\[1 em]x &= 1&& \\[1 em] \end{aligned} $$
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