N+15+3=n

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Solution for N+15+3=n equation: 


Simplifying
N + 15 + 3 = n

Reorder the terms:
15 + 3 + N = n

Combine like terms: 15 + 3 = 18
18 + N = n

Solving
18 + N = n

Solving for variable 'N'.

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

Add '-18' to each side of the equation.
18 + -18 + N = -18 + n

Combine like terms: 18 + -18 = 0
0 + N = -18 + n
N = -18 + n

Simplifying
N = -18 + n

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