x=(-2x)-21

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Solution for x=(-2x)-21 equation: 


Simplifying
x = (-2x) + -21

Reorder the terms:
x = -21 + (-2x)

Solving
x = -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.
x + (2x) = -21 + (-2x) + (2x)

Combine like terms: x + (2x) = 3x
3x = -21 + (-2x) + (2x)

Combine like terms: (-2x) + (2x) = 0
3x = -21 + 0
3x = -21

Divide each side by '3'.
x = -7

Simplifying
x = -7

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