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Properties of exponents challenge (integer exponents)

Neil tried to simplify an expression step by step.
5654=56(4)Step 1=52Step 2=152Step 3\begin{aligned} &\dfrac{5^{-6}} {5^{-4}} \\\\ =&5^{-6-(-4)}&\green{\text{Step } 1} \\\\ =&5^{-2}&\blue{\text{Step } 2} \\\\ =&\dfrac{1}{5^2}&\purple{\text{Step } 3} \end{aligned}
Find Neil's mistake.
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Choose 1 answer: