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x/y/7=2 (2)
12x/y=5
X=5*y/12
reemplazamos
5*y/12X __sobre__ y/7 = 2
35/12X= 2
35=24x
35/24=X
5*y= 12(35/24)
5*y=35/12
y=35/12/5/1
y=7/12