N+(n+1)+(n+2)=-87

Solution for N+(n+1)+(n+2)=-87 equation:

Simplifying
N + (n + 1) + (n + 2) = -87

Reorder the terms:
N + (1 + n) + (n + 2) = -87

Remove parenthesis around (1 + n)
N + 1 + n + (n + 2) = -87

Reorder the terms:
N + 1 + n + (2 + n) = -87

Remove parenthesis around (2 + n)
N + 1 + n + 2 + n = -87

Reorder the terms:
1 + 2 + N + n + n = -87

Combine like terms: 1 + 2 = 3
3 + N + n + n = -87

Combine like terms: n + n = 2n
3 + N + 2n = -87

Solving
3 + N + 2n = -87

Solving for variable 'N'.

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

Add '-3' to each side of the equation.
3 + N + -3 + 2n = -87 + -3

Reorder the terms:
3 + -3 + N + 2n = -87 + -3

Combine like terms: 3 + -3 = 0
0 + N + 2n = -87 + -3
N + 2n = -87 + -3

Combine like terms: -87 + -3 = -90
N + 2n = -90

Add '-2n' to each side of the equation.
N + 2n + -2n = -90 + -2n

Combine like terms: 2n + -2n = 0
N + 0 = -90 + -2n
N = -90 + -2n

Simplifying
N = -90 + -2n