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Rana= x+1
Ecuación
x+x+1= 7
2x+1=7
2x= 7-1
2x= 6
x= 6/2
x= 3
Reemplazando x
Renacuajos= 3
Ranas= 3+1 = 4
R= hay 3 relaciones y 4 ranas