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5x=2-4y
x=(2-4y)/5
Sustituimos en la segunda:
4(2-4y)/5+5y=-2
Despejamos y:
8-16y+25y=-10
9y=-18
y=-18/9
y=-2
Sustituimos y=-2 en el despeje:
x=(2-4y)/5
x=(2-4(-2))/5
x=(2+8)/5
x=10/5
x=2