N+2n+3n=90

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Solution for N+2n+3n=90 equation: 


Simplifying
N + 2n + 3n = 90

Combine like terms: 2n + 3n = 5n
N + 5n = 90

Solving
N + 5n = 90

Solving for variable 'N'.

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

Add '-5n' to each side of the equation.
N + 5n + -5n = 90 + -5n

Combine like terms: 5n + -5n = 0
N + 0 = 90 + -5n
N = 90 + -5n

Simplifying
N = 90 + -5n

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