Answer:
n = 2
Step-by-step explanation:
Given
- 6n + 21 = 12n - 15 ( collect terms in n on the left and numbers on the right )
Subtract 12n from both sides
- 18n + 21 = - 15 ( subtract 21 from both sides )
- 18n = - 36 ( divide both sides by - 18 )
n = 2
