X+X=X-x

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Solution for X+X=X-x equation: 


Simplifying
X + X = X + -1x

Combine like terms: X + X = 2X
2X = X + -1x

Solving
2X = X + -1x

Solving for variable 'X'.

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

Add '-1X' to each side of the equation.
2X + -1X = X + -1X + -1x

Combine like terms: 2X + -1X = 1X
1X = X + -1X + -1x

Combine like terms: X + -1X = 0
1X = 0 + -1x
1X = -1x

Divide each side by '1'.
X = -1x

Simplifying
X = -1x

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