9x+3=3(13-x)

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



9x+3=3(13-x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

9x-(3(-1x+13))+3=0



We calculate terms in parentheses: -(3(-1x+13)), so:

3(-1x+13)

We multiply parentheses

-3x+39

Back to the equation:

-(-3x+39)



We get rid of parentheses

9x+3x-39+3=0

We add all the numbers together, and all the variables

12x-36=0

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

12x=36

x=36/12

x=3

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