21=-7(u+2)

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Solution for 21=-7(u+2) equation: 



21=-7(u+2)

We move all terms to the left:

21-(-7(u+2))=0



We calculate terms in parentheses: -(-7(u+2)), so:

-7(u+2)

We multiply parentheses

-7u-14

Back to the equation:

-(-7u-14)



We get rid of parentheses

7u+14+21=0

We add all the numbers together, and all the variables

7u+35=0

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

7u=-35

u=-35/7

u=-5

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