X+2x+3x=12+6

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Solution for X+2x+3x=12+6 equation: 


Simplifying
X + 2x + 3x = 12 + 6

Combine like terms: 2x + 3x = 5x
X + 5x = 12 + 6

Combine like terms: 12 + 6 = 18
X + 5x = 18

Solving
X + 5x = 18

Solving for variable 'X'.

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

Add '-5x' to each side of the equation.
X + 5x + -5x = 18 + -5x

Combine like terms: 5x + -5x = 0
X + 0 = 18 + -5x
X = 18 + -5x

Simplifying
X = 18 + -5x

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