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

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



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

We move all terms to the left:

-4u-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

-4u+9u+36-21=0

We add all the numbers together, and all the variables

5u+15=0

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

5u=-15

u=-15/5

u=-3

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