21=12+n

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Solution for 21=12+n equation:


Simplifying
21 = 12 + n

Solving
21 = 12 + n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
21 + -1n = 12 + n + -1n

Combine like terms: n + -1n = 0
21 + -1n = 12 + 0
21 + -1n = 12

Add '-21' to each side of the equation.
21 + -21 + -1n = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -1n = 12 + -21
-1n = 12 + -21

Combine like terms: 12 + -21 = -9
-1n = -9

Divide each side by '-1'.
n = 9

Simplifying
n = 9

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