31=40-3x

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Solution for 31=40-3x equation: 



31=40-3x

We move all terms to the left:

31-(40-3x)=0

We add all the numbers together, and all the variables

-(-3x+40)+31=0

We get rid of parentheses

3x-40+31=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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