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Stiin ca x-2×y=48 si x+y=31,aflati y

Răspuns :

x-2*y=48
x+y=31

x=31-y
31-y-2y=48

x=31-y
31-3y=48

x=31-y
-3y=15

x=31-y
y=-5

x=36
y=-5