-21=-9-n

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Solution for -21=-9-n equation:


Simplifying
-21 = -9 + -1n

Solving
-21 = -9 + -1n

Solving for variable 'n'.

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

Add 'n' to each side of the equation.
-21 + n = -9 + -1n + n

Combine like terms: -1n + n = 0
-21 + n = -9 + 0
-21 + n = -9

Add '21' to each side of the equation.
-21 + 21 + n = -9 + 21

Combine like terms: -21 + 21 = 0
0 + n = -9 + 21
n = -9 + 21

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

Simplifying
n = 12

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