Answers

2014-05-17T15:58:25+05:30
-1+x=5/7
x=5/7+1
x=12/7
so -1+12/7=5/7
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2014-05-17T16:05:55+05:30
Let the number x should be added in -1 to get 5/7 then 
-1 + x = 5/7
x = 5/7 + 1
x = 12/7
hence the number is 12/7

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