9-9=12x+9x

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Solution for 9-9=12x+9x equation: 


Simplifying
9 + -9 = 12x + 9x

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

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

Solving
0 = 21x

Solving for variable 'x'.

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

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

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

Divide each side by '-21'.
x = 0

Simplifying
x = 0

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