$$ \begin{aligned} 283-x &= 15x+11&& \text{move the $ \color{blue}{ 15x } $ to the left side and $ \color{blue}{ 283 }$ to the right} \\[1 em]-x-15x &= 11-283&& \text{simplify left and right hand side} \\[1 em]-16x &= -272&& \text{ divide both sides by $ -16 $ } \\[1 em]x &= \frac{-272}{-16}&& \\[1 em]x &= 17&& \\[1 em] \end{aligned} $$
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