3x+9x=20

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Solution for 3x+9x=20 equation: 



3x+9x=20

We move all terms to the left:

3x+9x-(20)=0

We add all the numbers together, and all the variables

12x-20=0

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

12x=20

x=20/12

x=1+2/3

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