5n+7n = 60
12n =60
n=60/12
n=5
FRACCION EQUIVALENTE
5*n/7*n = (5*5)/(7*5) = 25/35
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entonces 5k+7k=60 => k=5
reemplazamos en 5k/7k
y sale 25/35 (Respuesta)
5n+7n = 60
12n =60
n=60/12
n=5
FRACCION EQUIVALENTE
5*n/7*n = (5*5)/(7*5) = 25/35