Find the mistake in one-step equations

Katy tried to solve an equation step by step. $\qquad\begin{align} r-3&=14.3\\\\ \\ r-3+3&=14.3-3&\green{\text{Step } 1}\\\\ \\ r&=11.3&\blue{\text{Step } 2}\\\\ \end{align}$ **Find Katy's mistake.** [[☃ radio 1]]