Question

Not really sure how to do this, could use some help. Much appreciated. :D

Answer 1

Answer:

n = 3

Step-by-step explanation:

start by combining 'like' terms on each side of equation to get:

7n - 9 = -3n + 21

add 3n to each side to get:

10n - 9 = 21

add 9 to each side to get:

10n = 30

n = 30/10 or n = 3

Check:

7(3) - 9 = -3(3) + 21

21 - 9 = -9 + 21

12 = 12

Answer 2

Answer:24n

Step-by-step explanation:

4n+3n=7n

7n-9=2n

2n-5n=3n

3n+21=24n