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x=2y
70x+85y=2700 dividimos todo entre 5 14x+17y=540
sustituimos x=2y en la segunda ecuacion.
14x+17y=540
14(2y)+17y=540
28y+117y=540
45y=540
y=540/45
y=12
si y=12
x=2y
x=2(12)
x=24
hay 24 vacas y 12 bueyes