Question
$$x-3 = 2x+1$$
Answer
$$ x = -4 $$
Explanation
$$ \begin{aligned} x-3 &= 2x+1&& \text{move the $ \color{blue}{ 2x } $ to the left side and $ \color{blue}{ -3 }$ to the right} \\[1 em]x-2x &= 1+3&& \text{simplify left and right hand side} \\[1 em]-x &= 4&& \text{switch signs on both sides} \\[1 em]x &= -4&& \\[1 em] \end{aligned} $$
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