Nigel tried to solve an equation step by step. \qquad\begin{aligned}

Nigel tried to solve an equation step by step. \qquad\begin{aligned} \dfrac12(2h-4)&=20 \\ 2h-4&=10&\green{\text{Step } 1} \\ 2h&=14&\blue{\text{Step } 2} \\ h&=7&\purple{\text{Step } 3} \end{aligned} 2 1 ​ (2h−4) 2h−4 2h h ​ =20 =10 =14 =7 ​ Step 1 Step 2 Step 3 ​ Find Nigel’s mistake.

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