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y in (-oo:+oo)
y*((6*y-18)/2)-6 = 0
(y*(6*y-18))/2-6 = 0
(y*(6*y-18))/2+(-6*2)/2 = 0
y*(6*y-18)-6*2 = 0
6*y^2-18*y-12 = 0
6*y^2-18*y-12 = 0
6*(y^2-3*y-2) = 0
y^2-3*y-2 = 0
DELTA = (-3)^2-(-2*1*4)
DELTA = 17
DELTA > 0
y = (17^(1/2)+3)/(1*2) or y = (3-17^(1/2))/(1*2)
y = (17^(1/2)+3)/2 or y = (3-17^(1/2))/2
6*(y-((3-17^(1/2))/2))*(y-((17^(1/2)+3)/2)) = 0
(6*(y-((3-17^(1/2))/2))*(y-((17^(1/2)+3)/2)))/2 = 0
(6*(y-((3-17^(1/2))/2))*(y-((17^(1/2)+3)/2)))/2 = 0 // * 2
6*(y-((3-17^(1/2))/2))*(y-((17^(1/2)+3)/2)) = 0
( y-((17^(1/2)+3)/2) )
y-((17^(1/2)+3)/2) = 0 // + (17^(1/2)+3)/2
y = (17^(1/2)+3)/2
( y-((3-17^(1/2))/2) )
y-((3-17^(1/2))/2) = 0 // + (3-17^(1/2))/2
y = (3-17^(1/2))/2
y in { (17^(1/2)+3)/2, (3-17^(1/2))/2 }
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