13=-7u+3(u-5)

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Solution for 13=-7u+3(u-5) equation: 



13=-7u+3(u-5)

We move all terms to the left:

13-(-7u+3(u-5))=0



We calculate terms in parentheses: -(-7u+3(u-5)), so:

-7u+3(u-5)

We multiply parentheses

-7u+3u-15

We add all the numbers together, and all the variables

-4u-15

Back to the equation:

-(-4u-15)



We get rid of parentheses

4u+15+13=0

We add all the numbers together, and all the variables

4u+28=0

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

4u=-28

u=-28/4

u=-7

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