400=3x.x

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Solution for 400=3x.x equation: 



400=3x.x

We move all terms to the left:

400-(3x.x)=0

We add all the numbers together, and all the variables

-(+3x.x)+400=0

We get rid of parentheses

-3x.x+400=0

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

-3x.x=-400

x=-400/1

x=-400

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