Answer :

3/8 + x = 3/8  x   = (x)(3/8)(7/4)(x)(3/8)(7/4)  = 21/32x +  21/32x = 21/16 = 3/7
   7/4       7/4    7/4        (7/4)(7/4)        (7/4)(7/4)        49/16       49/16     49/16

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