40=13+3u

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Solution for 40=13+3u equation: 



40=13+3u

We move all terms to the left:

40-(13+3u)=0

We add all the numbers together, and all the variables

-(3u+13)+40=0

We get rid of parentheses

-3u-13+40=0

We add all the numbers together, and all the variables

-3u+27=0

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

-3u=-27

u=-27/-3

u=+9

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