21=4-(54/r)

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Solution for 21=4-(54/r) equation: 



21=4-(54/r)

We move all terms to the left:

21-(4-(54/r))=0



Domain of the equation: r))!=0

r!=0/1

r!=0

r∈R



We add all the numbers together, and all the variables

-(4-(+54/r))+21=0

We multiply all the terms by the denominator


-(4-(+54+21*r))=0



We calculate terms in parentheses: -(4-(+54+21*r)), so:

4-(+54+21*r)

determiningTheFunctionDomain
-(+54+21*r)+4

We add all the numbers together, and all the variables

-(21r+54)+4

We get rid of parentheses

-21r-54+4

We add all the numbers together, and all the variables

-21r-50

Back to the equation:

-(-21r-50)



We get rid of parentheses

21r+50=0

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

21r=-50

r=-50/21

r=-2+8/21

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