4=1/20r-5

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Solution for 4=1/20r-5 equation: 



4=1/20r-5

We move all terms to the left:

4-(1/20r-5)=0



Domain of the equation: 20r-5)!=0

r∈R



We get rid of parentheses

-1/20r+5+4=0

We multiply all the terms by the denominator


5*20r+4*20r-1=0

Wy multiply elements

100r+80r-1=0

We add all the numbers together, and all the variables

180r-1=0

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

180r=1

r=1/180

r=1/180

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