420=x+.4x

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Solution for 420=x+.4x equation: 



420=x+.4x

We move all terms to the left:

420-(x+.4x)=0

We add all the numbers together, and all the variables

-(+1.4x)+420=0

We get rid of parentheses

-1.4x+420=0

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

-1.4x=-420

x=-420/-1.4

x=+300

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