31=3(3-x)+1

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Solution for 31=3(3-x)+1 equation: 



31=3(3-x)+1

We move all terms to the left:

31-(3(3-x)+1)=0

We add all the numbers together, and all the variables

-(3(-1x+3)+1)+31=0



We calculate terms in parentheses: -(3(-1x+3)+1), so:

3(-1x+3)+1

We multiply parentheses

-3x+9+1

We add all the numbers together, and all the variables

-3x+10

Back to the equation:

-(-3x+10)



We get rid of parentheses

3x-10+31=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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