((2+n)-3)=12

Solution for ((2+n)-3)=12 equation:

Simplifying
((2 + n) + -3) = 12

Remove parenthesis around (2 + n)
(2 + n + -3) = 12

Reorder the terms:
(2 + -3 + n) = 12

Combine like terms: 2 + -3 = -1
(-1 + n) = 12

Remove parenthesis around (-1 + n)
-1 + n = 12

Solving
-1 + n = 12

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 + n = 12 + 1

Combine like terms: -1 + 1 = 0
0 + n = 12 + 1
n = 12 + 1

Combine like terms: 12 + 1 = 13
n = 13

Simplifying
n = 13