Question
$$9x+7 = 11x+20$$
Answer
$$ x = -\dfrac{13}{2} $$
Explanation
$$ \begin{aligned} 9x+7 &= 11x+20&& \text{move the $ \color{blue}{ 11x } $ to the left side and $ \color{blue}{ 7 }$ to the right} \\[1 em]9x-11x &= 20-7&& \text{simplify left and right hand side} \\[1 em]-2x &= 13&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= -\frac{13}{2}&& \\[1 em] \end{aligned} $$
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