-6u+21=-9(u-4)

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Solution for -6u+21=-9(u-4) equation: 



-6u+21=-9(u-4)

We move all terms to the left:

-6u+21-(-9(u-4))=0



We calculate terms in parentheses: -(-9(u-4)), so:

-9(u-4)

We multiply parentheses

-9u+36

Back to the equation:

-(-9u+36)



We get rid of parentheses

-6u+9u-36+21=0

We add all the numbers together, and all the variables

3u-15=0

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

3u=15

u=15/3

u=5

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