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Remember, you can multiply a scalar value "k" by any row of a determinant like this:
Note: you can pick any row. In this example, I'm using the first row.
Start with the given equation.
Since the bottom row of the resulting determinant is 2, 4, and 6 this means that this row is 2 times the bottom row of the given determinant.
Multiply both sides by 2
Multiply the scalar 2 by the entire bottom row of the determinant
So the answer is