u-8.31=4.2

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Solution for u-8.31=4.2 equation: 



u-8.31=4.2

We move all terms to the left:

u-8.31-(4.2)=0

We add all the numbers together, and all the variables

u-12.51=0

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

u=12.51

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