9-6x-6x=21

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Solution for 9-6x-6x=21 equation: 


Simplifying
9 + -6x + -6x = 21

Combine like terms: -6x + -6x = -12x
9 + -12x = 21

Solving
9 + -12x = 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 + -12x = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -12x = 21 + -9
-12x = 21 + -9

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

Divide each side by '-12'.
x = -1

Simplifying
x = -1

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