3x+9=31.

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Solution for 3x+9=31. equation: 



3x+9=31.

We move all terms to the left:

3x+9-(31.)=0

We add all the numbers together, and all the variables

3x+9-31=0

We add all the numbers together, and all the variables

3x-22=0

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

3x=22

x=22/3

x=7+1/3

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