130/2r=2r/2r

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Solution for 130/2r=2r/2r equation: 


r in (-oo:+oo)

(130/2)*r = ((2*r)/2)*r // - ((2*r)/2)*r

(130/2)*r-(((2*r)/2)*r) = 0

(130/2)*r-r^2 = 0

65*r-r^2 = 0

DELTA = 65^2-(-1*0*4)

DELTA = 4225

DELTA > 0

r = (4225^(1/2)-65)/(-1*2) or r = (-4225^(1/2)-65)/(-1*2)

r = 0 or r = 65

r in { 0, 65 }

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