X+9=18-2X

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Solution for X+9=18-2X equation:


Simplifying
X + 9 = 18 + -2X

Reorder the terms:
9 + X = 18 + -2X

Solving
9 + X = 18 + -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.
9 + X + 2X = 18 + -2X + 2X

Combine like terms: X + 2X = 3X
9 + 3X = 18 + -2X + 2X

Combine like terms: -2X + 2X = 0
9 + 3X = 18 + 0
9 + 3X = 18

Add '-9' to each side of the equation.
9 + -9 + 3X = 18 + -9

Combine like terms: 9 + -9 = 0
0 + 3X = 18 + -9
3X = 18 + -9

Combine like terms: 18 + -9 = 9
3X = 9

Divide each side by '3'.
X = 3

Simplifying
X = 3

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