31=3+7x

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Solution for 31=3+7x equation: 



31=3+7x

We move all terms to the left:

31-(3+7x)=0

We add all the numbers together, and all the variables

-(7x+3)+31=0

We get rid of parentheses

-7x-3+31=0

We add all the numbers together, and all the variables

-7x+28=0

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

-7x=-28

x=-28/-7

x=+4

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