A group of marbles is arranged into x rows and y columns. If the number of columns is 7 times the number of rows, and there are 343 total marbles, how many rows are there?

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A group of marbles is arranged into <em>x</em> rows and <em>y</em> columns. If the number of columns is 7 times the number of rows, and there are 343 total marbles, how many rows are there?