Question
$$-4x+5 = -8x+21$$
Answer
$$ x = 4 $$
Explanation
$$ \begin{aligned} -4x+5 &= -8x+21&& \text{move the $ \color{blue}{ -8x } $ to the left side and $ \color{blue}{ 5 }$ to the right} \\[1 em]-4x+8x &= 21-5&& \text{simplify left and right hand side} \\[1 em]4x &= 16&& \text{ divide both sides by $ 4 $ } \\[1 em]x &= \frac{16}{4}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$
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