$$x+121 = 180$$
Answer
$$ x = 59 $$
Explanation
$$ \begin{aligned} x+121 &= 180&& \text{ move 121 to the right } \\[1 em]x &= 180-121&& \\[1 em]x &= 59&& \\[1 em]x &= 59&& \\[1 em] \end{aligned} $$
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