12+9x=120

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Solution for 12+9x=120 equation: 



12+9x=120

We move all terms to the left:

12+9x-(120)=0

We add all the numbers together, and all the variables

9x-108=0

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

9x=108

x=108/9

x=12

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