x+3x+9x=100

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Solution for x+3x+9x=100 equation: 



x+3x+9x=100

We move all terms to the left:

x+3x+9x-(100)=0

We add all the numbers together, and all the variables

13x-100=0

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

13x=100

x=100/13

x=7+9/13

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