12n+9=-3n

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Solution for 12n+9=-3n equation:


Simplifying
12n + 9 = -3n

Reorder the terms:
9 + 12n = -3n

Solving
9 + 12n = -3n

Solving for variable 'n'.

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

Add '3n' to each side of the equation.
9 + 12n + 3n = -3n + 3n

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

Combine like terms: -3n + 3n = 0
9 + 15n = 0

Add '-9' to each side of the equation.
9 + -9 + 15n = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 15n = 0 + -9
15n = 0 + -9

Combine like terms: 0 + -9 = -9
15n = -9

Divide each side by '15'.
n = -0.6

Simplifying
n = -0.6

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