12-9=4n+15

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Solution for 12-9=4n+15 equation:


Simplifying
12 + -9 = 4n + 15

Combine like terms: 12 + -9 = 3
3 = 4n + 15

Reorder the terms:
3 = 15 + 4n

Solving
3 = 15 + 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.
3 + -4n = 15 + 4n + -4n

Combine like terms: 4n + -4n = 0
3 + -4n = 15 + 0
3 + -4n = 15

Add '-3' to each side of the equation.
3 + -3 + -4n = 15 + -3

Combine like terms: 3 + -3 = 0
0 + -4n = 15 + -3
-4n = 15 + -3

Combine like terms: 15 + -3 = 12
-4n = 12

Divide each side by '-4'.
n = -3

Simplifying
n = -3

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