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Find the mistake in one-step equations

Problem

Paulo tried to solve an equation.
f0.25=16f0.250.25=160.25Setting upf=4Calculating\begin{aligned} \dfrac f{0.25}&=16\\\\ \dfrac{f}{0.25} \cdot0.25&=16\cdot0.25&\tealE{\text{Setting up}}\\\\ f&=4&\purpleD{\text{Calculating}} \end{aligned}
Where did Paulo make his first mistake?
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