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If you start with a number, add 2/5, then multiply by 7, the result is 6 3/10. What was the original number?

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Laurakressleinid
(x+2/5)7=63/10
then divide both sides by 7
x+2/5=63/70
subtract 2/5 from both sides
and x= 1/2 

*x=original number

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