15=3(13-2u)

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Solution for 15=3(13-2u) equation: 



15=3(13-2u)

We move all terms to the left:

15-(3(13-2u))=0

We add all the numbers together, and all the variables

-(3(-2u+13))+15=0



We calculate terms in parentheses: -(3(-2u+13)), so:

3(-2u+13)

We multiply parentheses

-6u+39

Back to the equation:

-(-6u+39)



We get rid of parentheses

6u-39+15=0

We add all the numbers together, and all the variables

6u-24=0

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

6u=24

u=24/6

u=4

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