(12+9)=(13x+1)

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Solution for (12+9)=(13x+1) equation: 



(12+9)=(13x+1)

We move all terms to the left:

(12+9)-((13x+1))=0

We add all the numbers together, and all the variables

-((13x+1))+21=0



We calculate terms in parentheses: -((13x+1)), so:

(13x+1)

We get rid of parentheses

13x+1

Back to the equation:

-(13x+1)



We get rid of parentheses

-13x-1+21=0

We add all the numbers together, and all the variables

-13x+20=0

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

-13x=-20

x=-20/-13

x=1+7/13

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