21=-n

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Solution for 21=-n equation:


Simplifying
21 = -1n

Solving
21 = -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 = -1n + n

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

Add '-21' to each side of the equation.
21 + -21 + n = 0 + -21

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

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

Simplifying
n = -21

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