31-13=3(x-9)

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Solution for 31-13=3(x-9) equation: 



31-13=3(x-9)

We move all terms to the left:

31-13-(3(x-9))=0

We add all the numbers together, and all the variables

-(3(x-9))+18=0



We calculate terms in parentheses: -(3(x-9)), so:

3(x-9)

We multiply parentheses

3x-27

Back to the equation:

-(3x-27)



We get rid of parentheses

-3x+27+18=0

We add all the numbers together, and all the variables

-3x+45=0

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

-3x=-45

x=-45/-3

x=+15

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