3n+(9+3)=15

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Solution for 3n+(9+3)=15 equation:


Simplifying
3n + (9 + 3) = 15

Combine like terms: 9 + 3 = 12
3n + (12) = 15
3n + 12 = 15

Reorder the terms:
12 + 3n = 15

Solving
12 + 3n = 15

Solving for variable 'n'.

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

Add '-12' to each side of the equation.
12 + -12 + 3n = 15 + -12

Combine like terms: 12 + -12 = 0
0 + 3n = 15 + -12
3n = 15 + -12

Combine like terms: 15 + -12 = 3
3n = 3

Divide each side by '3'.
n = 1

Simplifying
n = 1

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