Comme un jeu

Consider the following sequence of algebraic manipulations:$$\begin{aligned}[t] 0 \times 2 &= 0 & \text{Line 1} \\ (1-1) \times 2 &= (1-1) & \text{Line 2} && (\text{since } 1-1 = 0) \\ 2 &= \frac{(1-1)}{(1-1)} & \text{Line 3} && (\text{Division by } (1-1)) \\ 2 &= \frac{1}{1} & \text{Line 4} && (\text{Cancellation of } (1-1)) \\ 2 &= 1 & \text{Line 5} && (\text{Simplification})\end{aligned}$$This sequence appears to show that $2=1$, which is a false result. Identify the line where an invalid mathematical operation is performed.The error occurs in Line