-9-12=8-4n

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Solution for -9-12=8-4n equation:


Simplifying
-9 + -12 = 8 + -4n

Combine like terms: -9 + -12 = -21
-21 = 8 + -4n

Solving
-21 = 8 + -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.
-21 + 4n = 8 + -4n + 4n

Combine like terms: -4n + 4n = 0
-21 + 4n = 8 + 0
-21 + 4n = 8

Add '21' to each side of the equation.
-21 + 21 + 4n = 8 + 21

Combine like terms: -21 + 21 = 0
0 + 4n = 8 + 21
4n = 8 + 21

Combine like terms: 8 + 21 = 29
4n = 29

Divide each side by '4'.
n = 7.25

Simplifying
n = 7.25

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