X+4x+2x=21

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Solution for X+4x+2x=21 equation: 


Simplifying
X + 4x + 2x = 21

Combine like terms: 4x + 2x = 6x
X + 6x = 21

Solving
X + 6x = 21

Solving for variable 'X'.

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

Add '-6x' to each side of the equation.
X + 6x + -6x = 21 + -6x

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

Simplifying
X = 21 + -6x

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