8.4=0.4x

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Solution for 8.4=0.4x equation: 



8.4=0.4x

We move all terms to the left:

8.4-(0.4x)=0

We add all the numbers together, and all the variables

-(+0.4x)+8.4=0

We get rid of parentheses

-0.4x+8.4=0

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

-0.4x=-8.4

x=-8.4/-0.4

x=+21

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