4x+2x+x=21

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


Simplifying
4x + 2x + x = 21

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

Combine like terms: 6x + x = 7x
7x = 21

Solving
7x = 21

Solving for variable 'x'.

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

Divide each side by '7'.
x = 3

Simplifying
x = 3

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