9(2n + 1)
Distribute 9 to the terms in the brackets.
18n + 9
Add = 0 to solve for x
18n + 9 = 0
Move 9 to the other side by subtracting
18n = -9
Divide by 18 on both sides
n = -9/18
Simplify
n = -1/2
In decimal form the answer can also be -0.5 depending on your question.
Hope this helped!
