21=4(u+6)-7u

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Solution for 21=4(u+6)-7u equation: 



21=4(u+6)-7u

We move all terms to the left:

21-(4(u+6)-7u)=0



We calculate terms in parentheses: -(4(u+6)-7u), so:

4(u+6)-7u

We add all the numbers together, and all the variables

-7u+4(u+6)

We multiply parentheses

-7u+4u+24

We add all the numbers together, and all the variables

-3u+24

Back to the equation:

-(-3u+24)



We get rid of parentheses

3u-24+21=0

We add all the numbers together, and all the variables

3u-3=0

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

3u=3

u=3/3

u=1

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