Answer:
the answer you are looking for is -5<n<4
−6<3n+9<21
−6+−9<3n+9+−9<21+−9(Add -9 to all parts)
−15<3n<12
−15
3
<
3n
12
(Divide all parts by 3)
−5<n<4
Step-by-step explanation:
