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D( y )
y-9 = 0
y-9 = 0
y-9 = 0
y-9 = 0 // + 9
y = 9
y in (-oo:9) U (9:+oo)
4/3+6/3 = 10/(y-9) // - 10/(y-9)
4/3-(10/(y-9))+6/3 = 0
4/3-10*(y-9)^-1+6/3 = 0
4/3-10/(y-9)+2 = 0
(-10*3)/(3*(y-9))+(4*(y-9))/(3*(y-9))+(2*3*(y-9))/(3*(y-9)) = 0
4*(y-9)+2*3*(y-9)-10*3 = 0
4*y+6*y-66-54 = 0
10*y-120 = 0
(10*y-120)/(3*(y-9)) = 0
(10*y-120)/(3*(y-9)) = 0 // * 3*(y-9)
10*y-120 = 0
10*y-120 = 0 // + 120
10*y = 120 // : 10
y = 120/10
y = 12
y = 12
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