15=n+n+3

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Solution for 15=n+n+3 equation:


Simplifying
15 = n + n + 3

Reorder the terms:
15 = 3 + n + n

Combine like terms: n + n = 2n
15 = 3 + 2n

Solving
15 = 3 + 2n

Solving for variable 'n'.

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

Add '-2n' to each side of the equation.
15 + -2n = 3 + 2n + -2n

Combine like terms: 2n + -2n = 0
15 + -2n = 3 + 0
15 + -2n = 3

Add '-15' to each side of the equation.
15 + -15 + -2n = 3 + -15

Combine like terms: 15 + -15 = 0
0 + -2n = 3 + -15
-2n = 3 + -15

Combine like terms: 3 + -15 = -12
-2n = -12

Divide each side by '-2'.
n = 6

Simplifying
n = 6

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