-8=0.4u

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Solution for -8=0.4u equation: 



-8=0.4u

We move all terms to the left:

-8-(0.4u)=0

We add all the numbers together, and all the variables

-(+0.4u)-8=0

We get rid of parentheses

-0.4u-8=0

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

-0.4u=8

u=8/-0.4

u=-20

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