31=4u+3

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Solution for 31=4u+3 equation: 



31=4u+3

We move all terms to the left:

31-(4u+3)=0

We get rid of parentheses

-4u-3+31=0

We add all the numbers together, and all the variables

-4u+28=0

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

-4u=-28

u=-28/-4

u=+7

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