4.2=3.4+u

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Solution for 4.2=3.4+u equation: 



4.2=3.4+u

We move all terms to the left:

4.2-(3.4+u)=0

We add all the numbers together, and all the variables

-(u+3.4)+4.2=0

We get rid of parentheses

-u-3.4+4.2=0

We add all the numbers together, and all the variables

-1u+0.8=0

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

-u=-0.8

u=-0.8/-1

u=0.8/1

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