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2/3 x 5/7 = 6/11X
resolviendo
10/21 = 6/11X
6/11X = 10/21
X= 10/21 / 6/11
X = 55/63
comprobando resultado
2/3 x 5/7 = 10/21
6/11 x 55/63 = 10/21