-13=7+2u

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Solution for -13=7+2u equation: 



-13=7+2u

We move all terms to the left:

-13-(7+2u)=0

We add all the numbers together, and all the variables

-(2u+7)-13=0

We get rid of parentheses

-2u-7-13=0

We add all the numbers together, and all the variables

-2u-20=0

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

-2u=20

u=20/-2

u=-10

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