13+3x=31

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Solution for 13+3x=31 equation: 



13+3x=31

We move all terms to the left:

13+3x-(31)=0

We add all the numbers together, and all the variables

3x-18=0

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

3x=18

x=18/3

x=6

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