Question
$$50+25x = 30+30x$$
Answer
$$ x = 4 $$
Explanation
$$ \begin{aligned} 50+25x &= 30+30x&& \text{move the $ \color{blue}{ 30x } $ to the left side and $ \color{blue}{ 50 }$ to the right} \\[1 em]25x-30x &= 30-50&& \text{simplify left and right hand side} \\[1 em]-5x &= -20&& \text{ divide both sides by $ -5 $ } \\[1 em]x &= \frac{-20}{-5}&& \\[1 em]x &= 4&& \\[1 em] \end{aligned} $$
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