21=-x

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Solution for 21=-x equation: 


Simplifying
21 = -1x

Solving
21 = -1x

Solving for variable 'x'.

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

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

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

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

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

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

Simplifying
x = -21

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