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3x+5y=8
6x+8y=20
(-2)3x+5y=8
6x+8y=20
-6x-10y=-16
-2y=4
y=-2
5y+3x=8
6x+8y=20/x3
3x+5y=8/x(-6)
18x+24y=60
-18x-30y=(-18)
-6y=42
y=-7
Reemplazamos para hallar x
3x+5*(-7)=8
3x-35=8
3x=43
x=43/3