Question
$$x+24 = 4x\cdot2$$
Answer
$$ x = \dfrac{24}{7} $$
Explanation
$$ \begin{aligned} x+24 &= 4x\cdot2&& \text{move the $ \color{blue}{ 8x } $ to the left side and $ \color{blue}{ 24 }$ to the right} \\[1 em]x-8x &= -24&& \text{simplify left side} \\[1 em]-7x &= -24&& \text{ divide both sides by $ -7 $ } \\[1 em]x &= \frac{-24}{-7}&& \\[1 em]x &= \frac{24}{7}&& \\[1 em] \end{aligned} $$
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