-6u+21=-3(u-8)

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Solution for -6u+21=-3(u-8) equation: 



-6u+21=-3(u-8)

We move all terms to the left:

-6u+21-(-3(u-8))=0



We calculate terms in parentheses: -(-3(u-8)), so:

-3(u-8)

We multiply parentheses

-3u+24

Back to the equation:

-(-3u+24)



We get rid of parentheses

-6u+3u-24+21=0

We add all the numbers together, and all the variables

-3u-3=0

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

-3u=3

u=3/-3

u=-1

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