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x=(4-3y)/2
Reemplazando en 3x=2y-1 para hallar "y":
3x=2y-1
3((4-3y)/2)=2y-1
(12-9y)/2=2y-1
12-9y=4y-2
12+2=4y+9y
14=13y
y=14/13
Reemplazando el valor de "y" para hallar "x":
2x=4-3y
2x=4-3(14/13)
2x=4-42/13
2x=10/13
x=5/13