7.8
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14.8
If you mean 4 divided by 5/7 then it is 28/5 or 5.6 as a decimal
The decimal of 5 and 7 over 50 is expressed as 5.14
5 over 7 (or 5 divided by 7) is equal to 0.714285714.
7 4/21 in decimal form is 7.190476 . . .