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3x+2y=0
Igualamos una variable
2(2x+y)=2(-1)
4x+2y=-2
Ahora restamos ambas igualdades.
(4x+2y)-(3x+2y)=(-2)-(0)
4x+2y-3x-2y=-2
x=-2
2x+y=-1
2(-2)+y=-1
y=-1+4
y=3