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(6 × 7) ÷ 2 = 21
6 divided by 2/7 = 21
When starting out with two wholes, that makes 2*(7/7) or fourteen sevenths. Three seventh, or 3/7 is then added. Fourteen plus three makes for seventeen sevenths.
If 1 can be divided into 7 sevenths, you can multiply that by 2 to find that there are 14 sevenths in 2.
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