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Find the mistake in one-step equations

Gabi tried to solve an equation step by step.
j10=80j1010=8010Step 1j=800Step 2\qquad\begin{aligned} \dfrac j{10}&=80\\\\ \\ \dfrac{j}{10} \cdot 10&=80 \cdot10&\green{\text{Step } 1}\\\\ \\ j&=800&\blue{\text{Step } 2}\\\\ \end{aligned}
Find Gabi's mistake.
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Choose 1 answer: