-2x-9-2x=-21

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Solution for -2x-9-2x=-21 equation: 


Simplifying
-2x + -9 + -2x = -21

Reorder the terms:
-9 + -2x + -2x = -21

Combine like terms: -2x + -2x = -4x
-9 + -4x = -21

Solving
-9 + -4x = -21

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + -4x = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -4x = -21 + 9
-4x = -21 + 9

Combine like terms: -21 + 9 = -12
-4x = -12

Divide each side by '-4'.
x = 3

Simplifying
x = 3

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