255/r=15

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Solution for 255/r=15 equation: 


D( r )

r = 0

r = 0

r = 0

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

255/r = 15 // - 15

255/r-15 = 0

255*r^-1 = 15 // : 255

r^-1 = 1/17

-1 < 0

1/(r^1) = 1/17 // * r^1

1 = 1/17*r^1 // : 1/17

17 = r^1

r = 17

r = 17

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