Question 416969
3n+9+4n<2
3n+4n<2-9
7n<-7
n<-7/7
n<-1 ans.
Proof:
Let n=-1.1
3*-1.1+9+4*-1.1<2
-3.3+9-4.4<2
9-7.7<2
1.3<2