The pivot is the 20 in Row 2. Thus, we need to change Row 1, and so the operation will be written next to Row 2. the outline of the row operation is
Since the pivot column is the second column,
We can, ignoring the signs, give them the same numerical value if we multiply Row 1 by 4. Also, since both the entries in this column have opposite sign, we add (multiples of) the two rows. Therefore, the row operation is
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