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D( y )
7*y+9 = 0
7*y-4 = 0
7*y+9 = 0
7*y+9 = 0
7*y+9 = 0 // - 9
7*y = -9 // : 7
y = -9/7
7*y-4 = 0
7*y-4 = 0
7*y-4 = 0 // + 4
7*y = 4 // : 7
y = 4/7
y in (-oo:-9/7) U (-9/7:4/7) U (4/7:+oo)
-4/(7*y+9) = 9/(7*y-4) // - 9/(7*y-4)
-4/(7*y+9)-(9/(7*y-4)) = 0
-4/(7*y+9)-9*(7*y-4)^-1 = 0
-4/(7*y+9)-9/(7*y-4) = 0
(-4*(7*y-4))/((7*y+9)*(7*y-4))+(-9*(7*y+9))/((7*y+9)*(7*y-4)) = 0
-4*(7*y-4)-9*(7*y+9) = 0
-91*y-65 = 0
(-91*y-65)/((7*y+9)*(7*y-4)) = 0
(-91*y-65)/((7*y+9)*(7*y-4)) = 0 // * (7*y+9)*(7*y-4)
-91*y-65 = 0
-91*y-65 = 0 // + 65
-91*y = 65 // : -91
y = 65/(-91)
y = -5/7
y = -5/7
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