Get personalized answers to your unique questions on IDNLearn.com. Whether it's a simple query or a complex problem, our community has the answers you need.
Answer:
7.5
Step-by-step explanation:
1) 12n + 15 = 30
-15 -15
2) 2n = 15
/2n /2n
3) n = 7.5
4) 2 × 7.5 + 15 = 30