n+(n-9)=45

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Solution for n+(n-9)=45 equation:


Simplifying
n + (n + -9) = 45

Reorder the terms:
n + (-9 + n) = 45

Remove parenthesis around (-9 + n)
n + -9 + n = 45

Reorder the terms:
-9 + n + n = 45

Combine like terms: n + n = 2n
-9 + 2n = 45

Solving
-9 + 2n = 45

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 + 2n = 45 + 9

Combine like terms: -9 + 9 = 0
0 + 2n = 45 + 9
2n = 45 + 9

Combine like terms: 45 + 9 = 54
2n = 54

Divide each side by '2'.
n = 27

Simplifying
n = 27

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