7=1+3u

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Solution for 7=1+3u equation: 



7=1+3u

We move all terms to the left:

7-(1+3u)=0

We add all the numbers together, and all the variables

-(3u+1)+7=0

We get rid of parentheses

-3u-1+7=0

We add all the numbers together, and all the variables

-3u+6=0

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

-3u=-6

u=-6/-3

u=+2

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