7u+3=31

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Solution for 7u+3=31 equation: 



7u+3=31

We move all terms to the left:

7u+3-(31)=0

We add all the numbers together, and all the variables

7u-28=0

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

7u=28

u=28/7

u=4

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