0=-2x-21

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Solution for 0=-2x-21 equation: 


Simplifying
0 = -2x + -21

Reorder the terms:
0 = -21 + -2x

Solving
0 = -21 + -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
0 + 2x = -21 + -2x + 2x
Remove the zero:
2x = -21 + -2x + 2x

Combine like terms: -2x + 2x = 0
2x = -21 + 0
2x = -21

Divide each side by '2'.
x = -10.5

Simplifying
x = -10.5

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