21-9=6n

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Solution for 21-9=6n equation:


Simplifying
21 + -9 = 6n

Combine like terms: 21 + -9 = 12
12 = 6n

Solving
12 = 6n

Solving for variable 'n'.

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

Add '-6n' to each side of the equation.
12 + -6n = 6n + -6n

Combine like terms: 6n + -6n = 0
12 + -6n = 0

Add '-12' to each side of the equation.
12 + -12 + -6n = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -6n = 0 + -12
-6n = 0 + -12

Combine like terms: 0 + -12 = -12
-6n = -12

Divide each side by '-6'.
n = 2

Simplifying
n = 2

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