90-(n+18)=2n

Solution for 90-(n+18)=2n equation:

Simplifying
90 + -1(n + 18) = 2n

Reorder the terms:
90 + -1(18 + n) = 2n
90 + (18 * -1 + n * -1) = 2n
90 + (-18 + -1n) = 2n

Combine like terms: 90 + -18 = 72
72 + -1n = 2n

Solving
72 + -1n = 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.
72 + -1n + -2n = 2n + -2n

Combine like terms: -1n + -2n = -3n
72 + -3n = 2n + -2n

Combine like terms: 2n + -2n = 0
72 + -3n = 0

Add '-72' to each side of the equation.
72 + -72 + -3n = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -3n = 0 + -72
-3n = 0 + -72

Combine like terms: 0 + -72 = -72
-3n = -72

Divide each side by '-3'.
n = 24

Simplifying
n = 24