2u+3u+u=31

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Solution for 2u+3u+u=31 equation: 



2u+3u+u=31

We move all terms to the left:

2u+3u+u-(31)=0

We add all the numbers together, and all the variables

6u-31=0

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

6u=31

u=31/6

u=5+1/6

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