x+x+x+2x+2x=21

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


Simplifying
x + x + x + 2x + 2x = 21

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

Combine like terms: 2x + x = 3x
3x + 2x + 2x = 21

Combine like terms: 3x + 2x = 5x
5x + 2x = 21

Combine like terms: 5x + 2x = 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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