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Find the mistake in one-step equations

Rico tried to solve an equation step by step.
n+12=18.3n+1212=18.312Step 1n=5.7Step 2\qquad\begin{aligned} n+12&=18.3\\\\ \\ n+12-12&=18.3-12&\green{\text{Step } 1}\\\\ \\ n&=5.7&\blue{\text{Step } 2}\\\\ \end{aligned}
Find Rico's mistake.
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Choose 1 answer: