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y in (-oo:+oo)
y*((6*y-5)/2) = 7/9 // - 7/9
y*((6*y-5)/2)-(7/9) = 0
y*((6*y-5)/2)-7/9 = 0
(y*(6*y-5))/2-7/9 = 0
(9*y*(6*y-5))/(2*9)+(-7*2)/(2*9) = 0
9*y*(6*y-5)-7*2 = 0
54*y^2-45*y-14 = 0
54*y^2-45*y-14 = 0
54*y^2-45*y-14 = 0
DELTA = (-45)^2-(-14*4*54)
DELTA = 5049
DELTA > 0
y = (5049^(1/2)+45)/(2*54) or y = (45-5049^(1/2))/(2*54)
y = (3*561^(1/2)+45)/108 or y = (45-3*561^(1/2))/108
(y-((45-3*561^(1/2))/108))*(y-((3*561^(1/2)+45)/108)) = 0
((y-((45-3*561^(1/2))/108))*(y-((3*561^(1/2)+45)/108)))/(2*9) = 0
((y-((45-3*561^(1/2))/108))*(y-((3*561^(1/2)+45)/108)))/(2*9) = 0 // * 2*9
(y-((45-3*561^(1/2))/108))*(y-((3*561^(1/2)+45)/108)) = 0
( y-((3*561^(1/2)+45)/108) )
y-((3*561^(1/2)+45)/108) = 0 // + (3*561^(1/2)+45)/108
y = (3*561^(1/2)+45)/108
( y-((45-3*561^(1/2))/108) )
y-((45-3*561^(1/2))/108) = 0 // + (45-3*561^(1/2))/108
y = (45-3*561^(1/2))/108
y in { (3*561^(1/2)+45)/108, (45-3*561^(1/2))/108 }
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