X+X=30

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Solution for X+X=30 equation: 


Simplifying
X + X = 30

Combine like terms: X + X = 2X
2X = 30

Solving
2X = 30

Solving for variable 'X'.

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

Divide each side by '2'.
X = 15

Simplifying
X = 15

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