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y in (-oo:+oo)
((9*y-15)^2)/3 = 14 // - 14
((9*y-15)^2)/3-14 = 0
((9*y-15)^2)/3+(-14*3)/3 = 0
(9*y-15)^2-14*3 = 0
81*y^2-270*y+183 = 0
81*y^2-270*y+183 = 0
3*(27*y^2-90*y+61) = 0
27*y^2-90*y+61 = 0
DELTA = (-90)^2-(4*27*61)
DELTA = 1512
DELTA > 0
y = (1512^(1/2)+90)/(2*27) or y = (90-1512^(1/2))/(2*27)
y = (6*42^(1/2)+90)/54 or y = (90-6*42^(1/2))/54
3*(y-((90-6*42^(1/2))/54))*(y-((6*42^(1/2)+90)/54)) = 0
(3*(y-((90-6*42^(1/2))/54))*(y-((6*42^(1/2)+90)/54)))/3 = 0
(3*(y-((90-6*42^(1/2))/54))*(y-((6*42^(1/2)+90)/54)))/3 = 0 // * 3
3*(y-((90-6*42^(1/2))/54))*(y-((6*42^(1/2)+90)/54)) = 0
( y-((6*42^(1/2)+90)/54) )
y-((6*42^(1/2)+90)/54) = 0 // + (6*42^(1/2)+90)/54
y = (6*42^(1/2)+90)/54
( y-((90-6*42^(1/2))/54) )
y-((90-6*42^(1/2))/54) = 0 // + (90-6*42^(1/2))/54
y = (90-6*42^(1/2))/54
y in { (6*42^(1/2)+90)/54, (90-6*42^(1/2))/54 }
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