3/r=39/65

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Solution for 3/r=39/65 equation: 


D( r )

r = 0

r = 0

r = 0

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

3/r = 39/65 // - 39/65

3/r-(39/65) = 0

3/r-3/5 = 0

3*r^-1 = 3/5 // : 3

r^-1 = 1/5

-1 < 0

1/(r^1) = 1/5 // * r^1

1 = 1/5*r^1 // : 1/5

5 = r^1

r = 5

r = 5

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