Omar tried to solve an equation step by step.
$\qquad\begin{align}
3x&=4.5\\\\
\\
\dfrac{3x}3&=\dfrac{4.5}3&\green{\text{Step } 1}\\\\
\\
x&=1.5&\blue{\text{Step } 2}\\\\
\end{align}$
**Find Omar's mistake.**
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