-13=-7+3u

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Solution for -13=-7+3u equation: 



-13=-7+3u

We move all terms to the left:

-13-(-7+3u)=0

We add all the numbers together, and all the variables

-(3u-7)-13=0

We get rid of parentheses

-3u+7-13=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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