x+x=400

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Solution for x+x=400 equation: 


Simplifying
x + x = 400

Combine like terms: x + x = 2x
2x = 400

Solving
2x = 400

Solving for variable 'x'.

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

Divide each side by '2'.
x = 200

Simplifying
x = 200

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