Question
$$x+7 = 13+7x$$
Answer
$$ x = -1 $$
Explanation
$$ \begin{aligned} x+7 &= 13+7x&& \text{move the $ \color{blue}{ 7x } $ to the left side and $ \color{blue}{ 7 }$ to the right} \\[1 em]x-7x &= 13-7&& \text{simplify left and right hand side} \\[1 em]-6x &= 6&& \text{ divide both sides by $ -6 $ } \\[1 em]x &= -\frac{6}{6}&& \\[1 em]x &= -1&& \\[1 em] \end{aligned} $$
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