n+15=-2n

Solution for n+15=-2n equation:

Simplifying
n + 15 = -2n

Reorder the terms:
15 + n = -2n

Solving
15 + n = -2n

Solving for variable 'n'.

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

Add '2n' to each side of the equation.
15 + n + 2n = -2n + 2n

Combine like terms: n + 2n = 3n
15 + 3n = -2n + 2n

Combine like terms: -2n + 2n = 0
15 + 3n = 0

Add '-15' to each side of the equation.
15 + -15 + 3n = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 3n = 0 + -15
3n = 0 + -15

Combine like terms: 0 + -15 = -15
3n = -15

Divide each side by '3'.
n = -5

Simplifying
n = -5