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-3x + 4y = 0
Multiplicamos por 3 la ecuación 2
9x + 16y = 7
-9x + 12y = 0
Sumando: 28 y = 7 --> y = 1/4
Reemplazamos Y en cualquier ecuación
-9x + 12(1/4) = 0
9x = 12/4
9x = 3
x = 1/3