The row instruction is written next to Row 1, meaning that we are to replace Row 1 according to the instruction, 2R1 - 3R2. In words, this means

Now, rewrite the top row, going from left to right, as follows:

First entry:

Therefore, the first entry is -7.

Second entry:

This is the second entry.

Third entry:

Thus, the new first row is


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