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Stiind ca x + 2y=18 si 2× + 2y=14

Răspuns :

x+2y=18
2x+2y=14  l(-1)

x+2y=18
-2x-2y=-14
__________
-x  /   = 4 =>x=(-4)

-4+2y=18 =>2y=22 =>y=11