-21=-7/2u

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Solution for -21=-7/2u equation: 



-21=-7/2u

We move all terms to the left:

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



Domain of the equation: 2u)!=0

u!=0/1

u!=0

u∈R



We get rid of parentheses

7/2u-21=0

We multiply all the terms by the denominator


-21*2u+7=0

Wy multiply elements

-42u+7=0

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

-42u=-7

u=-7/-42

u=1/6

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