x+400=2(2x-400)

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Solution for x+400=2(2x-400) equation: 



x+400=2(2x-400)

We move all terms to the left:

x+400-(2(2x-400))=0



We calculate terms in parentheses: -(2(2x-400)), so:

2(2x-400)

We multiply parentheses

4x-800

Back to the equation:

-(4x-800)



We get rid of parentheses

x-4x+800+400=0

We add all the numbers together, and all the variables

-3x+1200=0

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

-3x=-1200

x=-1200/-3

x=+400

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