-12=0.4x

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Solution for -12=0.4x equation: 



-12=0.4x

We move all terms to the left:

-12-(0.4x)=0

We add all the numbers together, and all the variables

-(+0.4x)-12=0

We get rid of parentheses

-0.4x-12=0

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

-0.4x=12

x=12/-0.4

x=-30

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