$$ \begin{aligned} 3(x+2)-2x &= 123(x+2)-2x&& \text{simplify left and right hand side} \\[1 em]3x+6-2x &= 123x+246-2x&& \\[1 em]x+6 &= 121x+246&& \text{move the $ \color{blue}{ 121x } $ to the left side and $ \color{blue}{ 6 }$ to the right} \\[1 em]x-121x &= 246-6&& \text{simplify left and right hand side} \\[1 em]-120x &= 240&& \text{ divide both sides by $ -120 $ } \\[1 em]x &= -\frac{240}{120}&& \\[1 em]x &= -2&& \\[1 em] \end{aligned} $$

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