2/r=80

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Solution for 2/r=80 equation: 


D( r )

r = 0

r = 0

r = 0

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

2/r = 80 // - 80

2/r-80 = 0

2*r^-1 = 80 // : 2

r^-1 = 40

-1 < 0

1/(r^1) = 40 // * r^1

1 = 40*r^1 // : 40

1/40 = r^1

r = 1/40

r = 1/40

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