3.1=15.9-4u

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Solution for 3.1=15.9-4u equation: 



3.1=15.9-4u

We move all terms to the left:

3.1-(15.9-4u)=0

We add all the numbers together, and all the variables

-(-4u+15.9)+3.1=0

We get rid of parentheses

4u-15.9+3.1=0

We add all the numbers together, and all the variables

4u-12.8=0

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

4u=12.8

u=12.8/4

u=3+0.8/4

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