6+9=X+X

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Solution for 6+9=X+X equation: 


Simplifying
6 + 9 = X + X

Combine like terms: 6 + 9 = 15
15 = X + X

Combine like terms: X + X = 2X
15 = 2X

Solving
15 = 2X

Solving for variable 'X'.

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

Add '-2X' to each side of the equation.
15 + -2X = 2X + -2X

Combine like terms: 2X + -2X = 0
15 + -2X = 0

Add '-15' to each side of the equation.
15 + -15 + -2X = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -2X = 0 + -15
-2X = 0 + -15

Combine like terms: 0 + -15 = -15
-2X = -15

Divide each side by '-2'.
X = 7.5

Simplifying
X = 7.5

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