6x+3x=21

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Solution for 6x+3x=21 equation: 


Simplifying
6x + 3x = 21

Combine like terms: 6x + 3x = 9x
9x = 21

Solving
9x = 21

Solving for variable 'x'.

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

Divide each side by '9'.
x = 2.333333333

Simplifying
x = 2.333333333

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