15/r=10/12

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Solution for 15/r=10/12 equation: 


D( r )

r = 0

r = 0

r = 0

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

15/r = 10/12 // - 10/12

15/r-(10/12) = 0

15/r-5/6 = 0

15*r^-1 = 5/6 // : 15

r^-1 = 1/18

-1 < 0

1/(r^1) = 1/18 // * r^1

1 = 1/18*r^1 // : 1/18

18 = r^1

r = 18

r = 18

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