-u=3.9

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Solution for -u=3.9 equation: 



-u=3.9

We move all terms to the left:

-u-(3.9)=0

We add all the numbers together, and all the variables

-1u-3.9=0

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

-u=3.9

u=3.9/-1

u=-3+0.9/1

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