Question
$$9x+28 = x-28$$
Answer
$$ x = -7 $$
Explanation
$$ \begin{aligned} 9x+28 &= x-28&& \text{move the $ \color{blue}{ x } $ to the left side and $ \color{blue}{ 28 }$ to the right} \\[1 em]9x-x &= -28-28&& \text{simplify left and right hand side} \\[1 em]8x &= -56&& \text{ divide both sides by $ 8 $ } \\[1 em]x &= -\frac{56}{8}&& \\[1 em]x &= -7&& \\[1 em] \end{aligned} $$
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