21=7u+4(u+8)

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Solution for 21=7u+4(u+8) equation: 



21=7u+4(u+8)

We move all terms to the left:

21-(7u+4(u+8))=0



We calculate terms in parentheses: -(7u+4(u+8)), so:

7u+4(u+8)

We multiply parentheses

7u+4u+32

We add all the numbers together, and all the variables

11u+32

Back to the equation:

-(11u+32)



We get rid of parentheses

-11u-32+21=0

We add all the numbers together, and all the variables

-11u-11=0

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

-11u=11

u=11/-11

u=-1

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