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
7/4 7/4 7/4 (7/4)(7/4) (7/4)(7/4) 49/16 49/16 49/16