Nisha did the following work to solve an equation. Nisha's Work Step 1 7 b plus 3 point 2 b minus 5 is equal to 18 point 9 2 Step 2 10 point 2 b minus 5 is equal to 18 point 9 2 Step 3 5 point 2 b is equal to 18 point 9 2 Step 4 b is equal to 3 point 6 4 In which step did Nisha make her first error?