6x+9x=21x

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


Simplifying
6x + 9x = 21x

Combine like terms: 6x + 9x = 15x
15x = 21x

Solving
15x = 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.
15x + -21x = 21x + -21x

Combine like terms: 15x + -21x = -6x
-6x = 21x + -21x

Combine like terms: 21x + -21x = 0
-6x = 0

Divide each side by '-6'.
x = 0

Simplifying
x = 0

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