$$ \begin{aligned} 2(x+1)+7x &= x-12&& \text{simplify left side} \\[1 em]2x+2+7x &= x-12&& \\[1 em]9x+2 &= x-12&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 2 }$ to the right} \\[1 em]9x-x &= -12-2&& \text{simplify left and right hand side} \\[1 em]8x &= -14&& \text{ divide both sides by $ 8 $ } \\[1 em]x &= -\frac{14}{8}&& \\[1 em]x &= -\frac{7}{4}&& \\[1 em] \end{aligned} $$

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