4/r=5/20

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Solution for 4/r=5/20 equation: 


D( r )

r = 0

r = 0

r = 0

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

4/r = 5/20 // - 5/20

4/r-(5/20) = 0

4/r-1/4 = 0

4*r^-1 = 1/4 // : 4

r^-1 = 1/16

-1 < 0

1/(r^1) = 1/16 // * r^1

1 = 1/16*r^1 // : 1/16

16 = r^1

r = 16

r = 16

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