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(X+1)*(y+3)=24 cum o rezolv?

Răspuns :

xy+3x+y+3=24
xy+3x+y=21
xy+y+x=7 
(x+1) * (y+3) =24
xy+3x+y+3=24
xy+3x+y=24-3
xy+3x+y=21
x(y+3) +y=21
nu cred ca e mai mult