-21=3/5r

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Solution for -21=3/5r equation: 



-21=3/5r

We move all terms to the left:

-21-(3/5r)=0



Domain of the equation: 5r)!=0

r!=0/1

r!=0

r∈R



We add all the numbers together, and all the variables

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

We get rid of parentheses

-3/5r-21=0

We multiply all the terms by the denominator


-21*5r-3=0

Wy multiply elements

-105r-3=0

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

-105r=3

r=3/-105

r=-1/35

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