3x+2x+x=12

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Solution for 3x+2x+x=12 equation: 


Simplifying
3x + 2x + x = 12

Combine like terms: 3x + 2x = 5x
5x + x = 12

Combine like terms: 5x + x = 6x
6x = 12

Solving
6x = 12

Solving for variable 'x'.

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

Divide each side by '6'.
x = 2

Simplifying
x = 2

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