-4u+21=-9(u+1)

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Solution for -4u+21=-9(u+1) equation: 



-4u+21=-9(u+1)

We move all terms to the left:

-4u+21-(-9(u+1))=0



We calculate terms in parentheses: -(-9(u+1)), so:

-9(u+1)

We multiply parentheses

-9u-9

Back to the equation:

-(-9u-9)



We get rid of parentheses

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

We add all the numbers together, and all the variables

5u+30=0

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

5u=-30

u=-30/5

u=-6

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