-21=5(u-6)-8u

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Solution for -21=5(u-6)-8u equation: 



-21=5(u-6)-8u

We move all terms to the left:

-21-(5(u-6)-8u)=0



We calculate terms in parentheses: -(5(u-6)-8u), so:

5(u-6)-8u

We add all the numbers together, and all the variables

-8u+5(u-6)

We multiply parentheses

-8u+5u-30

We add all the numbers together, and all the variables

-3u-30

Back to the equation:

-(-3u-30)



We get rid of parentheses

3u+30-21=0

We add all the numbers together, and all the variables

3u+9=0

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

3u=-9

u=-9/3

u=-3

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