100=0.4*x

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Solution for 100=0.4*x equation: 



100=0.4x

We move all terms to the left:

100-(0.4x)=0

We add all the numbers together, and all the variables

-(+0.4x)+100=0

We get rid of parentheses

-0.4x+100=0

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

-0.4x=-100

x=-100/-0.4

x=+250

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