n+(n+1)=-21

Solution for n+(n+1)=-21 equation:

Simplifying
n + (n + 1) = -21

Reorder the terms:
n + (1 + n) = -21

Remove parenthesis around (1 + n)
n + 1 + n = -21

Reorder the terms:
1 + n + n = -21

Combine like terms: n + n = 2n
1 + 2n = -21

Solving
1 + 2n = -21

Solving for variable 'n'.

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

Add '-1' to each side of the equation.
1 + -1 + 2n = -21 + -1

Combine like terms: 1 + -1 = 0
0 + 2n = -21 + -1
2n = -21 + -1

Combine like terms: -21 + -1 = -22
2n = -22

Divide each side by '2'.
n = -11

Simplifying
n = -11