(121-2r)/r=5/3

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Solution for (121-2r)/r=5/3 equation: 


D( r )

r = 0

r = 0

r = 0

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

(121-(2*r))/r = 5/3 // - 5/3

(121-(2*r))/r-(5/3) = 0

(121-2*r)/r-5/3 = 0

(3*(121-2*r))/(3*r)+(-5*r)/(3*r) = 0

3*(121-2*r)-5*r = 0

363-11*r = 0

(363-11*r)/(3*r) = 0

(363-11*r)/(3*r) = 0 // * 3*r

363-11*r = 0

363-11*r = 0 // - 363

-11*r = -363 // : -11

r = -363/(-11)

r = 33

r = 33

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