20/r=5

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Solution for 20/r=5 equation: 



20/r=5

We move all terms to the left:

20/r-(5)=0



Domain of the equation: r!=0

r∈R



We multiply all the terms by the denominator


-5*r+20=0

We add all the numbers together, and all the variables

-5r+20=0

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

-5r=-20

r=-20/-5

r=+4

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