13=2u+3(u-4)

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Solution for 13=2u+3(u-4) equation: 



13=2u+3(u-4)

We move all terms to the left:

13-(2u+3(u-4))=0



We calculate terms in parentheses: -(2u+3(u-4)), so:

2u+3(u-4)

We multiply parentheses

2u+3u-12

We add all the numbers together, and all the variables

5u-12

Back to the equation:

-(5u-12)



We get rid of parentheses

-5u+12+13=0

We add all the numbers together, and all the variables

-5u+25=0

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

-5u=-25

u=-25/-5

u=+5

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