3x+6x=31

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Solution for 3x+6x=31 equation: 



3x+6x=31

We move all terms to the left:

3x+6x-(31)=0

We add all the numbers together, and all the variables

9x-31=0

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

9x=31

x=31/9

x=3+4/9

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