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D( y )
3*y-9 = 0
3*y-9 = 0
3*y-9 = 0
3*y-9 = 0 // + 9
3*y = 9 // : 3
y = 9/3
y = 3
y in (-oo:3) U (3:+oo)
y+2/3 = (2*y-12)/(3*y-9) // - (2*y-12)/(3*y-9)
y-((2*y-12)/(3*y-9))+2/3 = 0
(-1*(2*y-12))/(3*y-9)+y+2/3 = 0
(-1*3*(2*y-12))/(3*(3*y-9))+(3*y*(3*y-9))/(3*(3*y-9))+(2*(3*y-9))/(3*(3*y-9)) = 0
3*y*(3*y-9)-1*3*(2*y-12)+2*(3*y-9) = 0
9*y^2-33*y+6*y-18+36 = 0
9*y^2-27*y+18 = 0
9*y^2-27*y+18 = 0
9*(y^2-3*y+2) = 0
y^2-3*y+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
y = (1^(1/2)+3)/(1*2) or y = (3-1^(1/2))/(1*2)
y = 2 or y = 1
9*(y-1)*(y-2) = 0
(9*(y-1)*(y-2))/(3*(3*y-9)) = 0
(9*(y-1)*(y-2))/(3*(3*y-9)) = 0 // * 3*(3*y-9)
9*(y-1)*(y-2) = 0
( y-1 )
y-1 = 0 // + 1
y = 1
( y-2 )
y-2 = 0 // + 2
y = 2
y in { 1, 2 }
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