.3*u=3.9

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Solution for .3*u=3.9 equation: 



.3u=3.9

We move all terms to the left:

.3u-(3.9)=0

We add all the numbers together, and all the variables

.3u-3.9=0

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

.3u=3.9

u=3.9/.3

u=13

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