13=2u+7

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Solution for 13=2u+7 equation: 



13=2u+7

We move all terms to the left:

13-(2u+7)=0

We get rid of parentheses

-2u-7+13=0

We add all the numbers together, and all the variables

-2u+6=0

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

-2u=-6

u=-6/-2

u=+3

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