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II.2x+5y=-11
10x + 6y= 40
-10x - 25y= 55
-19y= 95
y= 95/-19
y= -5
Reemplazamos "y" en la I.
5x - 15 = 20
5x= 35
x= 35/5
x= 7
Solución: (7,-5)