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Find the mistake in one-step equations

Derek tried to solve an equation step by step.
8d=728d8=728Step 1d=8Step 2\qquad\begin{aligned} 8d&=72\\\\ \\ \dfrac{8d}{8}&=\dfrac{72}8&\green{\text{Step } 1}\\\\ \\ d&=8&\blue{\text{Step } 2}\\\\ \end{aligned}
Find Derek's mistake.
Choose 1 answer:
Choose 1 answer: