12+n=15

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Solution for 12+n=15 equation: 


Simplifying
12 + n = 15

Solving
12 + n = 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 + n = 15 + -12

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

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

Simplifying
n = 3

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