3900=(12x-400)+(6x-400)

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Solution for 3900=(12x-400)+(6x-400) equation: 



3900=(12x-400)+(6x-400)

We move all terms to the left:

3900-((12x-400)+(6x-400))=0



We calculate terms in parentheses: -((12x-400)+(6x-400)), so:

(12x-400)+(6x-400)

We get rid of parentheses

12x+6x-400-400

We add all the numbers together, and all the variables

18x-800

Back to the equation:

-(18x-800)



We get rid of parentheses

-18x+800+3900=0

We add all the numbers together, and all the variables

-18x+4700=0

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

-18x=-4700

x=-4700/-18

x=261+1/9

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