x+9x+3x=99

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Solution for x+9x+3x=99 equation: 



x+9x+3x=99

We move all terms to the left:

x+9x+3x-(99)=0

We add all the numbers together, and all the variables

13x-99=0

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

13x=99

x=99/13

x=7+8/13

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