12+9x=129

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Solution for 12+9x=129 equation: 



12+9x=129

We move all terms to the left:

12+9x-(129)=0

We add all the numbers together, and all the variables

9x-117=0

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

9x=117

x=117/9

x=13

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