5/14+3/21be subtracted to get 1/3
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5/14 + 3/21 - x = 1/3
let the number to be subtracted be x.
5/14 - x = 1/3 - 3/21
5/14 - x = 7-3/21
5/14 - x = 4/21
4/21 - 5/14 = -x
4*2/21*2 - 5*3/14*3 = -x [ take L.C.M]
8-15/42 = -x
-7/42 = -x
-1/6 = -x
1/6 = x
hope it helps !!
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