$$409-x = 113$$
Answer
$$ x = 296 $$
Explanation
$$ \begin{aligned} 409-x &= 113&& \text{ move 409 to the right } \\[1 em]-x &= 113-409&& \\[1 em]-x &= -296&& \text{switch signs on both sides} \\[1 em]x &= 296&& \\[1 em] \end{aligned} $$
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