Answer:
Step 2.
Step-by-step explanation:
Jamie tried to solve the equation.
![(2)/(5)n+7=12](https://img.qammunity.org/2023/formulas/mathematics/high-school/b590q0t0nm008g7m09829kuh33opmfrc5e.png)
Step 1: Subtract 7 from both sides:
![\begin{gathered} (2)/(5)n+7-7=12-7 \\ (2)/(5)n=5 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/8o6ml6ca6dxojeqwq5415i7k9k0r7kzre2.png)
Jamie's Step 1 was correct.
Step 2: Multiply both sides by 5
![\begin{gathered} (2)/(5)n*5=5*5 \\ 2n=25 \\ n=(25)/(2) \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/aev6mvco12puesai1romh9kxfmizhxln1i.png)
Observe that this is different from what Jamie has. Therefore, Jamie's mistake was in Step 2.