(N-9)+n=90

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Solution for (N-9)+n=90 equation:


Simplifying
(N + -9) + n = 90

Reorder the terms:
(-9 + N) + n = 90

Remove parenthesis around (-9 + N)
-9 + N + n = 90

Solving
-9 + N + n = 90

Solving for variable 'N'.

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

Add '9' to each side of the equation.
-9 + N + 9 + n = 90 + 9

Reorder the terms:
-9 + 9 + N + n = 90 + 9

Combine like terms: -9 + 9 = 0
0 + N + n = 90 + 9
N + n = 90 + 9

Combine like terms: 90 + 9 = 99
N + n = 99

Add '-1n' to each side of the equation.
N + n + -1n = 99 + -1n

Combine like terms: n + -1n = 0
N + 0 = 99 + -1n
N = 99 + -1n

Simplifying
N = 99 + -1n

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