Răspuns :
x apartine n* => nu poate fi 0
x=1.
3*1-1=3-2=2<8 ADEV
x=2
3*2-1=6-1=5 <8 ADEV
x=3
3*3-1=9-8=8 <8 FALS =>
X apartine {1,2}
x=1.
3*1-1=3-2=2<8 ADEV
x=2
3*2-1=6-1=5 <8 ADEV
x=3
3*3-1=9-8=8 <8 FALS =>
X apartine {1,2}