X+X+9=0

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Solution for X+X+9=0 equation: 


Simplifying
X + X + 9 = 0

Reorder the terms:
9 + X + X = 0

Combine like terms: X + X = 2X
9 + 2X = 0

Solving
9 + 2X = 0

Solving for variable 'X'.

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

Add '-9' to each side of the equation.
9 + -9 + 2X = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 2X = 0 + -9
2X = 0 + -9

Combine like terms: 0 + -9 = -9
2X = -9

Divide each side by '2'.
X = -4.5

Simplifying
X = -4.5

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