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Aflati x si y stiind ca : (x-3) (y+4) =12
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Răspuns :

x - 3=1y+4 = 12  =>  x=4 , y=8
x-3=3 y+4=4 => x=6 , y=0
x-3=2y+4=6 => x=5 , y =2