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D( y )
9*y-(4*y)-3 = 0
9*y-(4*y)-3 = 0
9*y-(4*y)-3 = 0
9*y-4*y-3 = 0
5*y-3 = 0 // + 3
5*y = 3 // : 5
y = 3/5
y in (-oo:3/5) U (3/5:+oo)
(y+8*y-7)/(9*y-(4*y)-3) = 2/3 // - 2/3
(y+8*y-7)/(9*y-(4*y)-3)-(2/3) = 0
(y+8*y-7)/(9*y-4*y-3)-2/3 = 0
(9*y-7)/(5*y-3)-2/3 = 0
(3*(9*y-7))/(3*(5*y-3))+(-2*(5*y-3))/(3*(5*y-3)) = 0
3*(9*y-7)-2*(5*y-3) = 0
17*y-15 = 0
(17*y-15)/(3*(5*y-3)) = 0
(17*y-15)/(3*(5*y-3)) = 0 // * 3*(5*y-3)
17*y-15 = 0
17*y-15 = 0 // + 15
17*y = 15 // : 17
y = 15/17
y = 15/17
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