21=8(u-3)+7u

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Solution for 21=8(u-3)+7u equation: 



21=8(u-3)+7u

We move all terms to the left:

21-(8(u-3)+7u)=0



We calculate terms in parentheses: -(8(u-3)+7u), so:

8(u-3)+7u

We add all the numbers together, and all the variables

7u+8(u-3)

We multiply parentheses

7u+8u-24

We add all the numbers together, and all the variables

15u-24

Back to the equation:

-(15u-24)



We get rid of parentheses

-15u+24+21=0

We add all the numbers together, and all the variables

-15u+45=0

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

-15u=-45

u=-45/-15

u=+3

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