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X+y=-20
X-y=16
Metodo de igualacion
X=-20-y
X=16+y
-20-y=16+y
-y-y=16+20
-2y=36
Y=-36/2
Y=-18
X=-20-(-18)
X=-20+18
X=-2
X=-2
Y=-18
Comprobacion
-2+(-18)=-20
-2-18=-20
-2-(-18)=16
-2+18=16