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

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


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

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

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

Combine like terms: 3x + x = 4x
4x + x + x + x + x = 21

Combine like terms: 4x + x = 5x
5x + x + x + x = 21

Combine like terms: 5x + x = 6x
6x + x + x = 21

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

Combine like terms: 7x + x = 8x
8x = 21

Solving
8x = 21

Solving for variable 'x'.

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

Divide each side by '8'.
x = 2.625

Simplifying
x = 2.625

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