31=x-3.9

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Solution for 31=x-3.9 equation: 



31=x-3.9

We move all terms to the left:

31-(x-3.9)=0

We get rid of parentheses

-x+3.9+31=0

We add all the numbers together, and all the variables

-1x+34.9=0

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

-x=-34.9

x=-34.9/-1

x=34+0.9/1

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