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D( y )
y-3 = 0
y+4 = 0
y-3 = 0
y-3 = 0
y-3 = 0 // + 3
y = 3
y+4 = 0
y+4 = 0
y+4 = 0 // - 4
y = -4
y in (-oo:-4) U (-4:3) U (3:+oo)
6/(y+4)-(2/(y-3)) = 3 // - 3
6/(y+4)-(2/(y-3))-3 = 0
6/(y+4)-2*(y-3)^-1-3 = 0
6/(y+4)-2/(y-3)-3 = 0
(6*(y-3))/((y+4)*(y-3))+(-2*(y+4))/((y+4)*(y-3))+(-3*(y+4)*(y-3))/((y+4)*(y-3)) = 0
6*(y-3)-2*(y+4)-3*(y+4)*(y-3) = 0
4*y-3*y^2-3*y-26+36 = 0
y-3*y^2+10 = 0
y-3*y^2+10 = 0
y-3*y^2+10 = 0
DELTA = 1^2-(-3*4*10)
DELTA = 121
DELTA > 0
y = (121^(1/2)-1)/(-3*2) or y = (-121^(1/2)-1)/(-3*2)
y = -5/3 or y = 2
(y+5/3)*(y-2) = 0
((y+5/3)*(y-2))/((y+4)*(y-3)) = 0
((y+5/3)*(y-2))/((y+4)*(y-3)) = 0 // * (y+4)*(y-3)
(y+5/3)*(y-2) = 0
( y+5/3 )
y+5/3 = 0 // - 5/3
y = -5/3
( y-2 )
y-2 = 0 // + 2
y = 2
y in { -5/3, 2 }
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