Question
$$20-4x = 3x+4$$
Answer
$$ x = \dfrac{16}{7} $$
Explanation
$$ \begin{aligned} 20-4x &= 3x+4&& \text{move the $ \color{blue}{ 3x } $ to the left side and $ \color{blue}{ 20 }$ to the right} \\[1 em]-4x-3x &= 4-20&& \text{simplify left and right hand side} \\[1 em]-7x &= -16&& \text{ divide both sides by $ -7 $ } \\[1 em]x &= \frac{-16}{-7}&& \\[1 em]x &= \frac{16}{7}&& \\[1 em] \end{aligned} $$
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