$$ \begin{aligned} 12x+96 &= x&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 96 }$ to the right} \\[1 em]12x-x &= -96&& \text{simplify left side} \\[1 em]11x &= -96&& \text{ divide both sides by $ 11 $ } \\[1 em]x &= -\frac{96}{11}&& \\[1 em] \end{aligned} $$