4=31-3x

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Solution for 4=31-3x equation: 



4=31-3x

We move all terms to the left:

4-(31-3x)=0

We add all the numbers together, and all the variables

-(-3x+31)+4=0

We get rid of parentheses

3x-31+4=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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