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D( y )
y = 0
y-10 = 0
y = 0
y = 0
y-10 = 0
y-10 = 0
y-10 = 0 // + 10
y = 10
y in (-oo:0) U (0:10) U (10:+oo)
9/y-(9/(y-10))-10 = 0
9/y-9*(y-10)^-1-10 = 0
9/y-9/(y-10)-10 = 0
(-9*y)/(y*(y-10))+(9*(y-10))/(y*(y-10))+(-10*y*(y-10))/(y*(y-10)) = 0
9*(y-10)-10*y*(y-10)-9*y = 0
100*y-10*y^2-90 = 0
100*y-10*y^2-90 = 0
10*(10*y-y^2-9) = 0
10*y-y^2-9 = 0
DELTA = 10^2-(-9*(-1)*4)
DELTA = 64
DELTA > 0
y = (64^(1/2)-10)/(-1*2) or y = (-64^(1/2)-10)/(-1*2)
y = 1 or y = 9
10*(y-1)*(y-9) = 0
(10*(y-1)*(y-9))/(y*(y-10)) = 0
(10*(y-1)*(y-9))/(y*(y-10)) = 0 // * y*(y-10)
10*(y-1)*(y-9) = 0
( y-1 )
y-1 = 0 // + 1
y = 1
( y-9 )
y-9 = 0 // + 9
y = 9
y in { 1, 9 }
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