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.