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determinati perechile(x,y)de nr intregi nenule pt care :xy+x-3y+3=0

Răspuns :

xy+y-3y+3=0
x(y+1)-3(y+1)=0
(x-3)(y+1)=0
x-3=0
x=3
y+1=0
y=-1
(3,-1)