Question
$$9e-7 = 7e-11$$
Answer
$$ e = -2 $$
Explanation
$$ \begin{aligned} 9e-7 &= 7e-11&& \text{move the $ \color{blue}{ 7e } $ to the left side and $ \color{blue}{ -7 }$ to the right} \\[1 em]9e-7e &= -11+7&& \text{simplify left and right hand side} \\[1 em]2e &= -4&& \text{ divide both sides by $ 2 $ } \\[1 em]e &= -\frac{4}{2}&& \\[1 em]e &= -2&& \\[1 em] \end{aligned} $$
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