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(7x-x)/8=(16-15)/(8*5)
6x/8=1/40
6x=1/5
X=1/30
2/5 - 3/8 = (16-15)/40= 1/40, entonces para hallar lo que le sobra a 7/8 de 1/40 tenemos que restar:
7/8 - 1/40 = (35 - 1)/40 = 34/40, al simplificarlo sería, 17/20.