$$2(18r+3) = 8r+6$$

$$ \begin{aligned} 2(18r+3) &= 8r+6&& \text{simplify left side} \\[1 em]36r+6 &= 8r+6&& \text{move the $ \color{blue}{ 8r } $ to the left side and $ \color{blue}{ 6 }$ to the right} \\[1 em]36r-8r &= 6-6&& \text{simplify left and right hand side} \\[1 em]28r &= 0&& \text{ divide both sides by $ 28 $ } \\[1 em]r &= \frac{0}{28}&& \\[1 em]r &= 0&& \\[1 em] \end{aligned} $$

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