-21=-7u+4(u-3)

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Solution for -21=-7u+4(u-3) equation: 



-21=-7u+4(u-3)

We move all terms to the left:

-21-(-7u+4(u-3))=0



We calculate terms in parentheses: -(-7u+4(u-3)), so:

-7u+4(u-3)

We multiply parentheses

-7u+4u-12

We add all the numbers together, and all the variables

-3u-12

Back to the equation:

-(-3u-12)



We get rid of parentheses

3u+12-21=0

We add all the numbers together, and all the variables

3u-9=0

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

3u=9

u=9/3

u=3

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