21=(-3)u

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Solution for 21=(-3)u equation: 



21=(-3)u

We move all terms to the left:

21-((-3)u)=0



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

(-3)u

We multiply parentheses

-3u

Back to the equation:

-(-3u)



We get rid of parentheses

3u+21=0

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

3u=-21

u=-21/3

u=-7

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