2x+9+x=129

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Solution for 2x+9+x=129 equation: 



2x+9+x=129

We move all terms to the left:

2x+9+x-(129)=0

We add all the numbers together, and all the variables

3x-120=0

We move all terms containing x to the left, all other terms to the right

3x=120

x=120/3

x=40

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