4+(n+9)=20

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Solution for 4+(n+9)=20 equation: 


Simplifying
4 + (n + 9) = 20

Reorder the terms:
4 + (9 + n) = 20

Remove parenthesis around (9 + n)
4 + 9 + n = 20

Combine like terms: 4 + 9 = 13
13 + n = 20

Solving
13 + n = 20

Solving for variable 'n'.

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

Add '-13' to each side of the equation.
13 + -13 + n = 20 + -13

Combine like terms: 13 + -13 = 0
0 + n = 20 + -13
n = 20 + -13

Combine like terms: 20 + -13 = 7
n = 7

Simplifying
n = 7

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