8n-9+n=18

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Solution for 8n-9+n=18 equation: 


Simplifying
8n + -9 + n = 18

Reorder the terms:
-9 + 8n + n = 18

Combine like terms: 8n + n = 9n
-9 + 9n = 18

Solving
-9 + 9n = 18

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 + 9 + 9n = 18 + 9

Combine like terms: -9 + 9 = 0
0 + 9n = 18 + 9
9n = 18 + 9

Combine like terms: 18 + 9 = 27
9n = 27

Divide each side by '9'.
n = 3

Simplifying
n = 3

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