-21=3/5u

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Solution for -21=3/5u equation: 



-21=3/5u

We move all terms to the left:

-21-(3/5u)=0



Domain of the equation: 5u)!=0

u!=0/1

u!=0

u∈R



We add all the numbers together, and all the variables

-(+3/5u)-21=0

We get rid of parentheses

-3/5u-21=0

We multiply all the terms by the denominator


-21*5u-3=0

Wy multiply elements

-105u-3=0

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

-105u=3

u=3/-105

u=-1/35

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