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completati 8/2x+1 este supraunitara => x €... b 6/X€N =>x €...
x+3/x=4/3.=>4/3=>x


Răspuns :

2x+1<8, 2x<7, x<7/2, x €{0,1,2,3}
b) 
x € {1,2,3,4,5}