How to solve 3n+9=7n-15

Question

Mathematics

Quinten

1 June, 07:49

How to solve 3n+9=7n-15

+3

Answers (2)

Know the Answer?

Jimena Bradford · Answer 1

Simplifying 3n + 9 = 7n + - 15

9 + 3n = 7n + - 15

9 + 3n = - 15 + 7n

9 + 3n = - 15 + 7n

9 + 3n + - 7n = - 15 + 7n + - 7n

3n + - 7n = - 4n 9 + - 4n = - 15 + 7n + - 7n

7n + - 7n = 0 9 + - 4n = - 15 + 0 9 + - 4n = - 15

9 + - 9 + - 4n = - 15 + - 9

9 + - 9 = 0 0 + - 4n = - 15 + - 9 - 4n = - 15 + - 9

-15 + - 9 = - 24 - 4n = - 24

Divide each side by - 4

n = 6

Amya Armstrong · Answer 2

Amya Armstrong 1 June, 11:46

0

The answer to this problem is 6