9+x+2x=12

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Solution for 9+x+2x=12 equation: 


Simplifying
9 + x + 2x = 12

Combine like terms: x + 2x = 3x
9 + 3x = 12

Solving
9 + 3x = 12

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 + 3x = 12 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 12 + -9
3x = 12 + -9

Combine like terms: 12 + -9 = 3
3x = 3

Divide each side by '3'.
x = 1

Simplifying
x = 1

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