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b = tus ovejas
•a+4 = 4 (b-4)
•b+2 = a-2 => b+4=a
Reemplazamos:
b+4+4= 4b-16
8=3b-16
24= 3b
8=b
Reemplazamos:
a+4 = 4(b-4)
a+4 = 4(8-4)
a+4 = 4(4)
a+4 = 16
a= 12