12/r=8/20

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Solution for 12/r=8/20 equation: 


D( r )

r = 0

r = 0

r = 0

r in (-oo:0) U (0:+oo)

12/r = 8/20 // - 8/20

12/r-(8/20) = 0

12/r-2/5 = 0

12*r^-1 = 2/5 // : 12

r^-1 = 1/30

-1 < 0

1/(r^1) = 1/30 // * r^1

1 = 1/30*r^1 // : 1/30

30 = r^1

r = 30

r = 30

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