X+2y+9=129

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Solution for X+2y+9=129 equation: 



X+2X+9=129

We move all terms to the left:

X+2X+9-(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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