I would use short division, though others would use long division, chunking or another method of their choice.
..... 1 2 1
... -------
7 | 814 7
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2541
847 x 7 = 7929
1 x 847, 7 x 121, 11 x 77
With no remainder, 7 goes into 6,000, 857 times. 6000 / 7 = 857.143
Get out calculator and divide the number by seven. If you can use a computer, use the calculator on your computer.