$$56x+40 = 48x+104$$
Answer
$$ x = 8 $$
Explanation
$$ \begin{aligned} 56x+40 &= 48x+104&& \text{move the $ \color{blue}{ 48x } $ to the left side and $ \color{blue}{ 40 }$ to the right} \\[1 em]56x-48x &= 104-40&& \text{simplify left and right hand side} \\[1 em]8x &= 64&& \text{ divide both sides by $ 8 $ } \\[1 em]x &= \frac{64}{8}&& \\[1 em]x &= 8&& \\[1 em] \end{aligned} $$
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