x+x+x=-21

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


Simplifying
x + x + x = -21

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

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

Solving
3x = -21

Solving for variable 'x'.

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

Divide each side by '3'.
x = -7

Simplifying
x = -7

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