-15=9n+3n

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Solution for -15=9n+3n equation: 


Simplifying
-15 = 9n + 3n

Combine like terms: 9n + 3n = 12n
-15 = 12n

Solving
-15 = 12n

Solving for variable 'n'.

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

Add '-12n' to each side of the equation.
-15 + -12n = 12n + -12n

Combine like terms: 12n + -12n = 0
-15 + -12n = 0

Add '15' to each side of the equation.
-15 + 15 + -12n = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -12n = 0 + 15
-12n = 0 + 15

Combine like terms: 0 + 15 = 15
-12n = 15

Divide each side by '-12'.
n = -1.25

Simplifying
n = -1.25

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