I am guessing that what you were trying to ask is "Does the matrix after we multiply the first row by 7 have the same row echelon form as the original matrix?"

If I have interpreted your question correctly, then the answer is yes: You can multiply any row by a scalar or add a scalar multiple of a row to another row without changing the row echelon form of the matrix.

If I haven't understood your question, I suggest you clarify it as others are likely having the same trouble