9x+3x=99

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Solution for 9x+3x=99 equation: 



9x+3x=99

We move all terms to the left:

9x+3x-(99)=0

We add all the numbers together, and all the variables

12x-99=0

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

12x=99

x=99/12

x=8+1/4

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