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r in (-oo:+oo)
-5/6 = r*((5*r-5)/5)-3 // - r*((5*r-5)/5)-3
3-(r*((5*r-5)/5))-5/6 = 0
(-1*r*(5*r-5))/5-5/6+3 = 0
(-1*6*r*(5*r-5))/(5*6)+(-5*5)/(5*6)+(3*5*6)/(5*6) = 0
3*5*6-1*6*r*(5*r-5)-5*5 = 0
30*r-30*r^2-25+90 = 0
30*r-30*r^2+65 = 0
30*r-30*r^2+65 = 0
5*(6*r-6*r^2+13) = 0
6*r-6*r^2+13 = 0
DELTA = 6^2-(-6*4*13)
DELTA = 348
DELTA > 0
r = (348^(1/2)-6)/(-6*2) or r = (-348^(1/2)-6)/(-6*2)
r = (2*87^(1/2)-6)/(-12) or r = (-2*87^(1/2)-6)/(-12)
5*(r-((2*87^(1/2)-6)/(-12)))*(r-((-2*87^(1/2)-6)/(-12))) = 0
(5*(r-((2*87^(1/2)-6)/(-12)))*(r-((-2*87^(1/2)-6)/(-12))))/(5*6) = 0
(5*(r-((2*87^(1/2)-6)/(-12)))*(r-((-2*87^(1/2)-6)/(-12))))/(5*6) = 0 // * 5*6
5*(r-((2*87^(1/2)-6)/(-12)))*(r-((-2*87^(1/2)-6)/(-12))) = 0
( r-((-2*87^(1/2)-6)/(-12)) )
r-((-2*87^(1/2)-6)/(-12)) = 0 // + (-2*87^(1/2)-6)/(-12)
r = (-2*87^(1/2)-6)/(-12)
( r-((2*87^(1/2)-6)/(-12)) )
r-((2*87^(1/2)-6)/(-12)) = 0 // + (2*87^(1/2)-6)/(-12)
r = (2*87^(1/2)-6)/(-12)
r in { (-2*87^(1/2)-6)/(-12), (2*87^(1/2)-6)/(-12) }
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