n+9=4n-12

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Solution for n+9=4n-12 equation:


Simplifying
n + 9 = 4n + -12

Reorder the terms:
9 + n = 4n + -12

Reorder the terms:
9 + n = -12 + 4n

Solving
9 + n = -12 + 4n

Solving for variable 'n'.

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

Add '-4n' to each side of the equation.
9 + n + -4n = -12 + 4n + -4n

Combine like terms: n + -4n = -3n
9 + -3n = -12 + 4n + -4n

Combine like terms: 4n + -4n = 0
9 + -3n = -12 + 0
9 + -3n = -12

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

Combine like terms: 9 + -9 = 0
0 + -3n = -12 + -9
-3n = -12 + -9

Combine like terms: -12 + -9 = -21
-3n = -21

Divide each side by '-3'.
n = 7

Simplifying
n = 7

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