21=-8u+3(u-8)

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Solution for 21=-8u+3(u-8) equation: 



21=-8u+3(u-8)

We move all terms to the left:

21-(-8u+3(u-8))=0



We calculate terms in parentheses: -(-8u+3(u-8)), so:

-8u+3(u-8)

We multiply parentheses

-8u+3u-24

We add all the numbers together, and all the variables

-5u-24

Back to the equation:

-(-5u-24)



We get rid of parentheses

5u+24+21=0

We add all the numbers together, and all the variables

5u+45=0

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

5u=-45

u=-45/5

u=-9

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