Question
$$x-11 = 16+4x$$
Answer
$$ x = -9 $$
Explanation
$$ \begin{aligned} x-11 &= 16+4x&& \text{move the $ \color{blue}{ 4x } $ to the left side and $ \color{blue}{ -11 }$ to the right} \\[1 em]x-4x &= 16+11&& \text{simplify left and right hand side} \\[1 em]-3x &= 27&& \text{ divide both sides by $ -3 $ } \\[1 em]x &= -\frac{27}{3}&& \\[1 em]x &= -9&& \\[1 em] \end{aligned} $$
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