9u+21=-4(u-2)

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Solution for 9u+21=-4(u-2) equation: 



9u+21=-4(u-2)

We move all terms to the left:

9u+21-(-4(u-2))=0



We calculate terms in parentheses: -(-4(u-2)), so:

-4(u-2)

We multiply parentheses

-4u+8

Back to the equation:

-(-4u+8)



We get rid of parentheses

9u+4u-8+21=0

We add all the numbers together, and all the variables

13u+13=0

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

13u=-13

u=-13/13

u=-1

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