2n+(n-9)=4.5

Solution for 2n+(n-9)=4.5 equation:

Simplifying
2n + (n + -9) = 4.5

Reorder the terms:
2n + (-9 + n) = 4.5

Remove parenthesis around (-9 + n)
2n + -9 + n = 4.5

Reorder the terms:
-9 + 2n + n = 4.5

Combine like terms: 2n + n = 3n
-9 + 3n = 4.5

Solving
-9 + 3n = 4.5

Solving for variable 'n'.

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

Add '9' to each side of the equation.
-9 + 9 + 3n = 4.5 + 9

Combine like terms: -9 + 9 = 0
0 + 3n = 4.5 + 9
3n = 4.5 + 9

Combine like terms: 4.5 + 9 = 13.5
3n = 13.5

Divide each side by '3'.
n = 4.5

Simplifying
n = 4.5