Suppose that the row operation

$$-38 R_{2} \longrightarrow R_{2}$$

is used to transform a matrix. Determine the row operation that will transform the matrix back to its original form. Use R1, R2, etc. to represent the rows $R_1$, $R_2$, etc. For example, if the required operation were "add 2 times row 4 to row 6" then the answer would be "$2*R4+R6 \longrightarrow R6$". If it were "swap row 4 with row 6" the answer would be "$R4 \longleftrightarrow R6$".

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