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D( y )
y+3 = 0
y+3 = 0
y+3 = 0
y+3 = 0 // - 3
y = -3
y in (-oo:-3) U (-3:+oo)
y-((15/(y+3))*(y-5))-(3*y) = 0
y-15*(y+3)^-1*(y-5)-3*y = 0
(-15*(y-5))/(y+3)+y-3*y = 0
(-15*(y-5))/(y+3)+(y*(y+3))/(y+3)+(-3*y*(y+3))/(y+3) = 0
y*(y+3)-15*(y-5)-3*y*(y+3) = 0
y^2-3*y^2-12*y-9*y+75 = 0
75-2*y^2-21*y = 0
75-2*y^2-21*y = 0
75-2*y^2-21*y = 0
DELTA = (-21)^2-(-2*4*75)
DELTA = 1041
DELTA > 0
y = (1041^(1/2)+21)/(-2*2) or y = (21-1041^(1/2))/(-2*2)
y = (1041^(1/2)+21)/(-4) or y = (21-1041^(1/2))/(-4)
(y-((1041^(1/2)+21)/(-4)))*(y-((21-1041^(1/2))/(-4))) = 0
((y-((1041^(1/2)+21)/(-4)))*(y-((21-1041^(1/2))/(-4))))/(y+3) = 0
((y-((1041^(1/2)+21)/(-4)))*(y-((21-1041^(1/2))/(-4))))/(y+3) = 0 // * y+3
(y-((1041^(1/2)+21)/(-4)))*(y-((21-1041^(1/2))/(-4))) = 0
( y-((1041^(1/2)+21)/(-4)) )
y-((1041^(1/2)+21)/(-4)) = 0 // + (1041^(1/2)+21)/(-4)
y = (1041^(1/2)+21)/(-4)
( y-((21-1041^(1/2))/(-4)) )
y-((21-1041^(1/2))/(-4)) = 0 // + (21-1041^(1/2))/(-4)
y = (21-1041^(1/2))/(-4)
y in { (1041^(1/2)+21)/(-4), (21-1041^(1/2))/(-4) }
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