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cum se rezolva exercitiul?
(x+1)*(y-1)=7


Răspuns :

x*y-x*1+1*y-1*1=7
x*y-x+y-1*1=7
x*y-x+y-1*1=7
x*y-x+y-1=7
xy-x+y-1=7
xy-x+y=7+1
xy-x+y=8