15=3(x-3)+x

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Solution for 15=3(x-3)+x equation: 



15=3(x-3)+x

We move all terms to the left:

15-(3(x-3)+x)=0



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

3(x-3)+x

We add all the numbers together, and all the variables

x+3(x-3)

We multiply parentheses

x+3x-9

We add all the numbers together, and all the variables

4x-9

Back to the equation:

-(4x-9)



We get rid of parentheses

-4x+9+15=0

We add all the numbers together, and all the variables

-4x+24=0

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

-4x=-24

x=-24/-4

x=+6

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