$$ \begin{aligned} 17x &= 18\cdot30&& \text{move the $ \color{blue}{ 540 } $ to the left side} \\[1 em]17x-540 &= 0&& \text{ move the constants to the right } \\[1 em]17x &= 540&& \text{ divide both sides by $ 17 $ } \\[1 em]x &= \frac{540}{17}&& \\[1 em] \end{aligned} $$