13+2x=31

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Solution for 13+2x=31 equation: 



13+2x=31

We move all terms to the left:

13+2x-(31)=0

We add all the numbers together, and all the variables

2x-18=0

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

2x=18

x=18/2

x=9

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