400(.8x)=1200(.5x)

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Solution for 400(.8x)=1200(.5x) equation: 



400(.8x)=1200(.5x)

We move all terms to the left:

400(.8x)-(1200(.5x))=0

We add all the numbers together, and all the variables

400(+.8x)-(1200(+.5x))=0

We multiply parentheses

400x-(1200(+.5x))=0



We calculate terms in parentheses: -(1200(+.5x)), so:

1200(+.5x)

We multiply parentheses

1200x

Back to the equation:

-(1200x)



We add all the numbers together, and all the variables

-800x=0

x=0/-800

x=0

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