-9=3(2n+1)

Solution for -9=3(2n+1) equation:

Simplifying
-9 = 3(2n + 1)

Reorder the terms:
-9 = 3(1 + 2n)
-9 = (1 * 3 + 2n * 3)
-9 = (3 + 6n)

Solving
-9 = 3 + 6n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-6n' to each side of the equation.
-9 + -6n = 3 + 6n + -6n

Combine like terms: 6n + -6n = 0
-9 + -6n = 3 + 0
-9 + -6n = 3

Add '9' to each side of the equation.
-9 + 9 + -6n = 3 + 9

Combine like terms: -9 + 9 = 0
0 + -6n = 3 + 9
-6n = 3 + 9

Combine like terms: 3 + 9 = 12
-6n = 12

Divide each side by '-6'.
n = -2

Simplifying
n = -2