x+x+x+4=31

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Solution for x+x+x+4=31 equation: 



x+x+x+4=31

We move all terms to the left:

x+x+x+4-(31)=0

We add all the numbers together, and all the variables

3x-27=0

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

3x=27

x=27/3

x=9

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