X+X-6=12

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Solution for X+X-6=12 equation: 


Simplifying
X + X + -6 = 12

Reorder the terms:
-6 + X + X = 12

Combine like terms: X + X = 2X
-6 + 2X = 12

Solving
-6 + 2X = 12

Solving for variable 'X'.

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

Add '6' to each side of the equation.
-6 + 6 + 2X = 12 + 6

Combine like terms: -6 + 6 = 0
0 + 2X = 12 + 6
2X = 12 + 6

Combine like terms: 12 + 6 = 18
2X = 18

Divide each side by '2'.
X = 9

Simplifying
X = 9

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