-9n+12n+(-9)=18

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Solution for -9n+12n+(-9)=18 equation:


Simplifying
-9n + 12n + (-9) = 18
-9n + 12n + -9 = 18

Reorder the terms:
-9 + -9n + 12n = 18

Combine like terms: -9n + 12n = 3n
-9 + 3n = 18

Solving
-9 + 3n = 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 + 3n = 18 + 9

Combine like terms: -9 + 9 = 0
0 + 3n = 18 + 9
3n = 18 + 9

Combine like terms: 18 + 9 = 27
3n = 27

Divide each side by '3'.
n = 9

Simplifying
n = 9

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