$$ \begin{aligned} 18 &= -6x+4(2x+3)&& \text{simplify right side} \\[1 em]18 &= -6x+8x+12&& \\[1 em]18 &= 2x+12&& \text{ swap the left and right side of the equation } \\[1 em]2x+12 &= 18&& \text{ move 12 to the right } \\[1 em]2x &= 18-12&& \\[1 em]2x &= 6&& \text{ divide both sides by $ 2 $ } \\[1 em]x &= \frac{6}{2}&& \\[1 em]x &= 3&& \\[1 em] \end{aligned} $$

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